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Mastering the Osteochondroma Examination Question

Orthopaedic Exam Margins Question: Master Enneking's Classifications

23 Apr 2026 58 min read 104 Views
Orthopaedic oncology Generic structured oral examination question 2: Margins

Key Takeaway

Looking for accurate information on Orthopaedic Exam Margins Question: Master Enneking's Classifications? For examination question margins, Enneking described four types: intralesional, where resection passes through the tumor; marginal, cutting through the reactive zone containing tumor micronodules; wide, resecting outside the reactive zone with a normal tissue cuff; and radical, involving *en bloc* removal of the entire tumor compartment, aiming for complete excision.

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Question 1

A 28-year-old male presents with a painful mass in his distal femur. Biopsy reveals high-grade osteosarcoma. Imaging shows cortical breach and skip lesions, but no distant metastases. According to Enneking's staging system for malignant tumors, what is the correct stage?





Explanation

High-grade osteosarcoma indicates G2. Cortical breach and skip lesions, but still contained within the compartment with extensive extraosseous extension (though not explicitly stated as 'extraosseous' for skip lesions, it implies local spread beyond the primary bone), denotes T2. No distant metastases indicates M0. Therefore, G2, T2, M0 corresponds to Stage IIB.

Question 2

Which surgical margin, as defined by Enneking, leaves microscopic disease beyond the reactive zone but macroscopic tumor intact?





Explanation

A marginal excision removes the tumor and its pseudocapsule, but may leave microscopic tumor cells within the reactive zone or pseudocapsule itself. This implies that the margin passes through the reactive zone. Intralesional passes through the tumor, wide passes through healthy tissue outside the reactive zone, and radical removes the entire compartment.

Question 3

A patient undergoes resection of a high-grade soft tissue sarcoma. Pathological examination of the resected specimen reveals tumor cells at the inked margin. Which Enneking surgical margin best describes this outcome?





Explanation

A positive inked margin, meaning tumor cells are at the edge of the specimen, indicates that the plane of dissection passed through the reactive zone or even the tumor itself, thus leaving potential microscopic disease behind. This aligns with the definition of a marginal excision, where the margin may be macroscopically clear but microscopically positive (or 'contaminated' through the reactive zone). Intralesional would mean gross tumor left behind or violated. A wide margin aims for a microscopically clear margin, and a radical margin removes the entire compartment, virtually guaranteeing clear margins if the compartment is appropriately defined.

Question 4

Which Enneking surgical margin requires removal of the entire anatomical compartment containing the tumor?





Explanation

A radical excision involves the removal of the entire anatomical compartment (e.g., quadriceps muscle group, entire bone) that contains the tumor, aiming for the highest likelihood of local tumor control by removing all tissue within the compartment. Wide excision removes the tumor with a cuff of normal tissue outside the pseudocapsule, but not necessarily the entire compartment.

Question 5

A 45-year-old female presents with a recurrent giant cell tumor of the distal radius after intralesional curettage. Pre-operative imaging shows significant cortical erosion but no skip lesions or metastasis. According to Enneking's staging for benign tumors, what is the appropriate stage for this recurrent tumor?





Explanation

Recurrent giant cell tumors, especially with cortical erosion, typically behave more aggressively than primary quiescent lesions. While Stage 3 is possible if there's extensive soft tissue mass, the description of cortical erosion and recurrence strongly points to an active stage, not aggressive which implies rapid extraosseous extension or pathological fracture. Stage 2 (Active) implies locally progressive disease, often with cortical thinning or erosion but still contained by the periosteum.

Question 6

What is the primary goal of a wide surgical margin in the treatment of a malignant bone tumor?





Explanation

A wide surgical margin involves excising the tumor along with a surrounding cuff of normal, healthy tissue that is outside the reactive zone and pseudocapsule. This aims to ensure all microscopic extensions are removed, achieving a clear margin microscopically. Option A describes marginal, Option B describes intralesional, and Option D describes radical.

Question 7

A biopsy reveals a low-grade chondrosarcoma (G1) of the proximal humerus. Imaging shows the tumor is entirely contained within the bone, with no evidence of extraosseous extension or metastasis. What is the correct Enneking stage?





Explanation

Low-grade malignancy (G1) combined with the tumor being intracompartmental (T1) and no metastasis (M0) corresponds to Stage IA in the Enneking system for malignant tumors.

Question 8

In the Enneking staging system for benign musculoskeletal tumors, which stage is characterized by a well-defined lesion surrounded by a sclerotic rim, typically asymptomatic or mildly symptomatic, and not growing?





Explanation

Stage 1 (Latent) benign tumors are characterized by slow growth, often asymptomatic, and surrounded by a mature reactive rim or sclerotic bone, indicating the host's effective containment of the lesion. Examples include non-ossifying fibromas or osteoid osteomas.

Question 9

A 12-year-old boy presents with an osteoid osteoma in the femoral neck. What Enneking benign tumor stage is typically associated with osteoid osteomas?





Explanation

Osteoid osteomas are classic examples of Stage 1 (Latent) benign tumors. They are self-limiting, grow slowly, and are typically well-circumscribed with a surrounding sclerotic reaction. While symptomatic, their biological behavior is non-aggressive in terms of local tissue destruction or spread.

Question 10

What is the key differentiator between Enneking's Stage IIA and Stage IIB malignant tumors?





Explanation

Both Stage IIA and Stage IIB are high-grade (G2) and lack metastasis (M0). The distinction lies in their local extent: Stage IIA tumors are intracompartmental (T1), while Stage IIB tumors are extracompartmental (T2). This extraosseous extension into surrounding tissues is a critical factor for surgical planning.

Question 11

When planning surgery for a Stage IIB osteosarcoma, which surgical margin is generally considered the minimum acceptable to achieve local control, assuming good response to neoadjuvant chemotherapy?





Explanation

For high-grade malignant tumors like Stage IIB osteosarcoma, a wide surgical margin is the standard goal to achieve local control. This aims for a microscopically negative margin through healthy tissue outside the reactive zone. Intralesional or marginal excisions have unacceptably high local recurrence rates for high-grade sarcomas. Radical excision is often reserved for situations where wide margins are difficult to achieve safely (e.g., specific anatomical locations) or for very large, extensive tumors.

Question 12

According to Enneking's staging, a musculoskeletal sarcoma with distant metastases, regardless of grade or local extent, falls into which stage?





Explanation

Any malignant tumor with distant metastases (M1) is automatically classified as Stage III in the Enneking system, regardless of its grade (G) or local extent (T). Metastatic disease significantly impacts prognosis and treatment strategy.

Question 13

A patient with a Stage 3 (Aggressive) benign tumor, such as an aggressive giant cell tumor with pathological fracture and significant soft tissue extension, typically requires which type of surgical margin?





Explanation

Stage 3 benign tumors exhibit aggressive local growth, often with cortical destruction, soft tissue extension, and high local recurrence rates if treated with intralesional or marginal methods. Therefore, a wide excision, aiming for clear margins through healthy tissue, is often necessary to achieve local control for these aggressive benign lesions, similar to low-grade malignancies.

Question 14

Which factor is NOT included in the Enneking Musculoskeletal Tumor Society (MSTS) staging system for malignant tumors?





Explanation

The Enneking MSTS staging system for malignant tumors uses Grade (G), Local Extent (T), and Metastasis (M). It does not explicitly include regional lymph node involvement as a primary staging criterion for sarcomas, unlike carcinomas. While lymph node metastases can occur, they are generally rare in sarcomas and, if present, would fall under M1 (distant metastasis).

Question 15

In the context of Enneking's staging, what does T1 signify for a malignant bone tumor?





Explanation

For Enneking's local extent (T) classification, T1 indicates that the tumor is intracompartmental, meaning it is confined within the bone or the soft tissue compartment of origin. T2 signifies extracompartmental involvement, extending beyond the primary compartment.

Question 16

What is the most significant prognostic factor in the Enneking MSTS staging system for malignant bone tumors?





Explanation

The presence of distant metastases (M1, leading to Stage III) is universally the most significant negative prognostic factor for musculoskeletal sarcomas, drastically reducing survival rates regardless of local grade or extent.

Question 17

An en bloc resection of a benign tumor with no gross tumor spillage but with microscopic tumor cells left behind at the margin of the pseudocapsule, would be classified as which Enneking surgical margin?





Explanation

A marginal excision removes the tumor and its surrounding pseudocapsule, or reactive zone, but the margin itself passes through this zone. This means microscopically, tumor cells might be left behind, even if macroscopically it appears complete.

Question 18

A biopsy reveals a high-grade undifferentiated pleomorphic sarcoma (G2) in the thigh, extending into multiple muscle compartments and encasing the femoral neurovascular bundle (T2). There are no distant metastases (M0). What is the Enneking stage?





Explanation

High-grade (G2), extracompartmental (T2), and no metastases (M0) classify this tumor as Enneking Stage IIB.

Question 19

Which of the following is an example of an aggressive (Stage 3) benign tumor according to Enneking's classification?





Explanation

Stage 3 benign tumors are characterized by rapid, destructive growth, often with cortical breakthrough, soft tissue extension, and high recurrence rates. Aneurysmal bone cysts, particularly those that are rapidly expanding and breaching the cortex, can exhibit this aggressive behavior. The other options are typically Stage 1 or 2.

Question 20

What type of surgical margin is usually employed for Stage 1 (Latent) benign tumors, given their well-circumscribed nature and minimal growth potential?





Explanation

Stage 1 benign tumors, being latent and well-contained, are usually effectively treated with intralesional procedures such as curettage, as the goal is merely to remove the lesion without needing extensive healthy tissue margins.

Question 21

Following neoadjuvant chemotherapy, a high-grade osteosarcoma shows excellent tumor necrosis (>90%). How does this typically impact the required Enneking surgical margin for local control?





Explanation

While excellent tumor necrosis after neoadjuvant chemotherapy is a positive prognostic indicator, it does not typically change the type of surgical margin required for a high-grade sarcoma. A wide surgical margin, aiming for microscopically clear tissue planes, remains the standard to achieve local control, as microscopic residual disease can persist even with good necrosis. The aim is still to resect through healthy tissue outside the reactive zone, which might have shrunk, but the principle of wide excision remains.

Question 22

Which characteristic defines a G2 tumor in the Enneking malignant staging system?





Explanation

G2 signifies a high histological grade, indicating a tumor with high mitotic activity, pleomorphism, and generally an aggressive biological behavior. G1 denotes low histological grade.

Question 23

A biopsy of a soft tissue mass reveals a low-grade liposarcoma (G1). MRI shows the tumor is well-circumscribed and contained entirely within the adductor compartment of the thigh (T1). No distant metastases are identified (M0). What is the Enneking stage?





Explanation

A low-grade tumor (G1) that is intracompartmental (T1) with no metastases (M0) is classified as Enneking Stage IA.

Question 24

For a Stage IIB malignant tumor, if a wide surgical margin is not achievable due to critical neurovascular involvement, what alternative surgical approach might be considered, potentially in conjunction with other therapies?





Explanation

If a wide surgical margin cannot be safely achieved while preserving limb function for a high-grade, extracompartmental tumor (Stage IIB), a radical resection, such as amputation or disarticulation, might be the only way to achieve adequate local control by removing the entire involved compartment.

Question 25

Which of the following scenarios would lead to an immediate Enneking Stage III classification for a malignant tumor?





Explanation

The presence of distant metastases (M1), such as lung metastases, automatically classifies any malignant tumor as Enneking Stage III, regardless of its grade or local extent.

Question 26

What is the primary determinant of tumor 'T' stage (T1 vs T2) in the Enneking system for bone sarcomas?





Explanation

The 'T' stage (local extent) in Enneking's system primarily differentiates based on whether the tumor is contained within its anatomical compartment (T1, intracompartmental) or has extended beyond it (T2, extracompartmental). Cortical integrity and pathological fracture are aspects that contribute to determining T stage, but the overarching principle is compartmental confinement.

Question 27

A biopsy indicates a low-grade chondrosarcoma (G1). Imaging shows the tumor has extended through the cortex into the adjacent soft tissues but remains relatively contained within the periosseous reactive zone (T2). No metastases are found (M0). What is the Enneking stage?





Explanation

A low-grade tumor (G1) that is extracompartmental (T2) and without metastases (M0) is classified as Enneking Stage IB.

Question 28

For a Stage 2 (Active) benign tumor, such as a symptomatic enchondroma with cortical expansion, what is the most appropriate surgical margin according to Enneking principles?





Explanation

Stage 2 benign tumors are locally active and progressive, often requiring more thorough removal than Stage 1 lesions. However, they are still typically treated with intralesional curettage, often augmented with adjuvant therapy (e.g., cryotherapy, phenol) to reduce recurrence rates, as they do not invade healthy tissue in the way malignant tumors do.

Question 29

What defines a surgical margin as 'intralesional' in Enneking's classification?





Explanation

An intralesional margin implies that the surgical incision or plane of dissection enters and passes through the tumor mass itself, resulting in macroscopic tumor being left behind or gross contamination of the wound.

Question 30

When evaluating the local extent (T-stage) of a bone tumor, which imaging modality is generally superior for determining compartmental involvement and soft tissue extension?





Explanation

MRI with contrast is superior for evaluating soft tissue involvement, marrow extension, neurovascular compromise, and assessing compartmental boundaries, all crucial for accurate T-staging in the Enneking system and surgical planning.

Question 31

A surgeon performs an intralesional curettage for a giant cell tumor. What is the expected Enneking surgical margin outcome?





Explanation

Intralesional curettage, by definition, means that the tumor is scooped out, and the plane of dissection is within the tumor itself. This is an intralesional margin and invariably leaves microscopic, if not macroscopic, tumor cells behind.

Question 32

Which of the following benign tumors is most likely to be classified as Stage 3 (Aggressive) and require a marginal or wide excision?





Explanation

Desmoid tumors, though histologically benign, are locally aggressive, infiltrative, and have a high local recurrence rate. They often necessitate marginal or even wide excisions to achieve local control, aligning with the characteristics of an Enneking Stage 3 benign tumor.

Question 33

According to the Enneking system, what is the 'reactive zone' surrounding a tumor?





Explanation

The reactive zone is a layer of compressed normal tissue, edema, and granulation tissue that forms a biological barrier around the tumor (or its pseudocapsule). It often contains microscopic tumor extensions, making it an unsafe plane for marginal excision of malignant lesions.

Question 34

What is the primary purpose of pathological evaluation of surgical margins after tumor resection?





Explanation

Pathological evaluation of surgical margins is crucial to assess if tumor cells are present at the edge of the resected specimen. A positive margin indicates inadequate resection and increases the risk of local recurrence, thereby guiding decisions for further surgery or adjuvant radiotherapy to achieve local control.

Question 35

A surgeon performs a curettage and bone graft for a benign bone tumor. If the lesion recurs, it suggests the initial margin was likely:





Explanation

Curettage, by its nature, is an intralesional procedure. If a benign tumor recurs after curettage, it strongly suggests that tumor cells were left behind, meaning the initial margin was intralesional (i.e., passed through the tumor or reactive zone without adequately removing it).

Question 36

For a primary bone sarcoma, which component of the Enneking staging system is typically determined after initial biopsy and imaging, but before definitive surgery?





Explanation

All three components of the Enneking staging system (G, T, M) are determined through a comprehensive workup including biopsy (for grade), imaging (for local extent and metastasis), and systemic surveys (for metastasis) before definitive surgery. This complete staging guides treatment planning, including the type of surgical margin required.

Question 37

What is the clinical significance of a positive 'skip lesion' in osteosarcoma?





Explanation

Skip lesions are foci of tumor that are separate from the primary lesion but within the same bone or compartment, usually detected by MRI. They indicate more widespread local disease than a single focus and are considered a form of extracompartmental extension, thus upgrading the T-stage to T2. While not distant metastases, they carry a poorer prognosis than isolated intracompartmental tumors and often require more aggressive local treatment.

Question 38

A 60-year-old male has a lesion in the tibia. Biopsy shows a very well-differentiated fibrous cortical defect (FCD). Clinically, it's asymptomatic. Which Enneking benign stage is most appropriate?





Explanation

Fibrous cortical defects (FCDs) are classic examples of Stage 1 (Latent) benign lesions. They are typically asymptomatic, self-limiting, and often spontaneously resolve. They are well-circumscribed and do not show active growth or local aggression.

Question 39

In planning a limb-sparing resection for a high-grade sarcoma, what is the MOST critical consideration regarding surgical margins?





Explanation

For high-grade sarcomas, the paramount goal of limb-sparing surgery is to achieve local oncologic control, which translates to obtaining a wide, microscopically negative surgical margin. This must be balanced with preserving limb function by protecting critical neurovascular structures, making it a delicate balance. A radical margin (e.g., amputation) might be necessary if wide margins cannot be achieved with limb preservation.

Question 40

What is the Enneking classification for a low-grade (G1), extracompartmental (T2) malignant tumor without distant metastases (M0)?





Explanation

G1 (low grade), T2 (extracompartmental), M0 (no metastases) corresponds to Enneking Stage IB.

Question 41

A pediatric patient presents with an Ewing sarcoma of the proximal tibia. Biopsy confirms G2. Staging scans show the tumor breaches the cortex and extends into the surrounding muscle, but there are no detectable skip lesions or distant metastases. What is the Enneking stage?





Explanation

Ewing sarcoma is inherently considered a high-grade (G2) malignancy. Cortical breach and extension into surrounding muscle signify extracompartmental involvement (T2). No distant metastases confirms M0. Therefore, G2, T2, M0 is Enneking Stage IIB.

Question 42

Which of the following would NOT be considered an anatomical barrier defining a compartment in the context of Enneking T-staging?





Explanation

While the epiphyseal growth plate is a physiological barrier in some contexts, in terms of Enneking's T-staging for compartmentalization, cortical bone, joint capsules, major fascial planes, and the periosteum are the primary anatomical structures that define and contain compartments. Tumor transgression of these structures is what determines T2 (extracompartmental) status.

Question 43

What is the main differentiating feature between Stage 2 (Active) and Stage 3 (Aggressive) benign tumors in the Enneking system?





Explanation

Stage 2 (Active) benign tumors show active growth and may cause cortical thinning, while Stage 3 (Aggressive) tumors show rapid, destructive growth, often with cortical breakthrough, extraosseous extension, and a high propensity for local recurrence, even mimicking low-grade malignancies in their behavior.

Question 44

A 35-year-old patient with an Enneking Stage IIB osteosarcoma of the proximal tibia undergoes neoadjuvant chemotherapy followed by limb-sparing resection. Post-operative pathology reveals a wide margin (microscopically negative). What is the local recurrence risk compared to a marginal margin?





Explanation

Achieving a wide, microscopically negative surgical margin is paramount for local control of high-grade sarcomas. Compared to a marginal margin, a wide margin significantly reduces the risk of local recurrence because it aims to resect through healthy, uninvolved tissue outside the reactive zone, ensuring no residual microscopic disease at the resection site.

Question 45

Which of the following statements about Enneking's staging of benign tumors is TRUE?





Explanation

The Enneking staging for benign tumors (Latent, Active, Aggressive) directly correlates with the recommended surgical margin. Latent tumors often need intralesional, Active may need aggressive intralesional, and Aggressive often require marginal or wide excisions. Benign tumors do not metastasize by definition (if they do, they are considered malignant transformation, not benign Stage 3).

Question 46

A biopsy shows a Grade 2 (G2) malignant fibrous histiocytoma (MFH) confined to the humeral shaft (T1). No distant metastases are detected (M0). What is the Enneking stage?





Explanation

A high-grade tumor (G2) that is intracompartmental (T1) and without metastases (M0) is classified as Enneking Stage IIA.

Question 47

What is the primary objective of using the Enneking staging system for musculoskeletal tumors?





Explanation

The Enneking staging system provides a standardized framework to classify musculoskeletal tumors (both benign and malignant) based on their biological aggressiveness and anatomical extent. Its primary utility is to guide surgical decision-making, especially the choice of the appropriate surgical margin, to optimize local tumor control and patient outcomes.

Question 48

Which of the following is considered a 'radical' margin in Enneking's classification for an osteosarcoma of the distal femur?





Explanation

A radical margin involves removing the entire anatomical compartment that contains the tumor. For a tumor of the distal femur, an above-knee amputation removes the entire femoral compartment, representing a radical excision. Options A, B, and C are intralesional or wide excisions. Option E could be radical for a soft tissue sarcoma in the thigh, but not for a bone tumor of the distal femur.

Question 49

A 40-year-old female presents with a benign lipoma in the subcutaneous tissue of her arm. It's mobile, non-tender, and has been stable for years. According to Enneking's benign staging, what is the most likely stage?





Explanation

A benign lipoma, stable and non-growing, is a classic example of an Enneking Stage 1 (Latent) benign tumor. It is well-circumscribed and shows no evidence of active or aggressive local behavior. Enneking staging applies to musculoskeletal tumors, including soft tissue.

Question 50

What is the main risk associated with an inadequate (e.g., intralesional or marginal) surgical margin for a high-grade malignant sarcoma?





Explanation

The primary and most significant risk of an inadequate surgical margin (intralesional or marginal) for a high-grade malignant sarcoma is a high local recurrence rate. Microscopic or macroscopic residual tumor cells at the surgical site are the direct cause of local failure.

Question 51

Which of the following scenarios describes an Enneking T2 classification for a bone sarcoma?





Explanation

T2 indicates an extracompartmental tumor. Extension through the cortex into surrounding soft tissues (even if seemingly contained by the periosteum in some interpretations, the critical point is beyond the bone proper) makes it extracompartmental. Skip lesions, even if intrabone, also constitute extracompartmental extension due to multifocal involvement within the larger bone compartment.

Question 52

When considering the prognosis of a Stage IIB osteosarcoma, which factor, beyond the Enneking stage, is most critical for long-term survival?





Explanation

While Enneking stage is crucial for prognosis, for high-grade sarcomas like osteosarcoma, the histological response to neoadjuvant chemotherapy (quantified by the percentage of tumor necrosis) is the single most important prognostic factor for long-term survival, independent of the surgical margin achieved. Good responders (>90% necrosis) have significantly better outcomes.

Question 53

A patient has a Stage IB chondrosarcoma of the proximal femur. Which surgical margin is most appropriate to achieve local control?





Explanation

Stage IB is a low-grade (G1) but extracompartmental (T2) malignant tumor. While low-grade, extracompartmental spread mandates a wide surgical margin to ensure adequate local control and prevent recurrence. Intralesional or marginal excisions would be insufficient for an extracompartmental malignant lesion, even if low-grade.

Question 54

Which Enneking surgical margin would result in gross tumor being left behind?





Explanation

An intralesional margin means the surgical plane passes through the tumor itself, thus leaving macroscopic tumor tissue behind. Marginal aims to remove the pseudocapsule but may leave microscopic tumor. Wide and radical aim for microscopically clear margins.

Question 55

What is the 'M' component of the Enneking staging system primarily assessing?





Explanation

The 'M' in Enneking's staging system (M0 vs. M1) stands for Metastasis and assesses the presence or absence of distant metastatic disease, which is a critical prognostic factor.

Question 56

A biopsy shows a high-grade pleomorphic sarcoma (G2) in the soft tissues of the thigh. Imaging reveals it is contained within the vastus lateralis compartment (T1). There are no distant metastases (M0). What is the Enneking stage?





Explanation

A high-grade tumor (G2) that is intracompartmental (T1) and without distant metastases (M0) is classified as Enneking Stage IIA.

Question 57

What is the distinction between a 'wide' and a 'radical' surgical margin in practical application for a bone tumor?





Explanation

A wide surgical margin involves excising the tumor with a surrounding cuff of uninvolved normal tissue, outside the reactive zone. A radical margin, on the other hand, involves removing the entire anatomical compartment (e.g., an entire bone or muscle group) containing the tumor. Radical is a much more extensive resection.

Question 58

For a Stage IA low-grade, intracompartmental sarcoma, what is the generally recommended surgical margin to achieve local control?





Explanation

Even for low-grade, intracompartmental malignant tumors (Stage IA), the standard of care for achieving local control is a wide surgical margin. While marginal excisions may be considered in very specific circumstances (e.g., certain chondrosarcomas), wide margins provide the best chance for local control for all sarcomas.

Question 59

Which statement best describes the Enneking system for benign tumors?





Explanation

The Enneking system for benign tumors classifies them into Stage 1 (Latent), Stage 2 (Active), and Stage 3 (Aggressive) based on their local biological behavior and destructive potential, which in turn guides the appropriate surgical approach.

Question 60

What surgical margin definition includes tumor cells present at the outermost inked surface of the resected specimen, as determined by a pathologist?





Explanation

A 'positive margin' specifically refers to the pathological finding of tumor cells at the inked edge of the resected specimen. This indicates that the surgical margin was inadequate, often correlating with an Enneking marginal or intralesional type of resection in terms of tumor remaining.

Question 61

A biopsy reveals a high-grade epithelioid sarcoma (G2) in the forearm. Imaging shows extensive soft tissue involvement but no bone invasion, confined within the forearm fascial compartments (T1). No distant metastases are detected (M0). What is the Enneking stage?





Explanation

High-grade (G2), intracompartmental (T1 - confined to forearm fascial compartments), and no metastases (M0) classify this as Enneking Stage IIA.

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