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10. Pathology and Oncology MCQs

Practice Set 61 of 351

This practice set contains high-yield board review questions covering key concepts in 10. Pathology and Oncology. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.

Question 1201

Topic: 10. Pathology and Oncology

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

. Presence of metastasis
. Tumor grade (low vs. high)
. Location (intracompartmental vs. extracompartmental)
. Size of the tumor
. Patient age

Correct Answer & Explanation

. Location (intracompartmental vs. extracompartmental)

Explanation

Correct Answer: CBoth 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 1202

Topic: 10. Pathology and Oncology

An asymptomatic 15-year-old male has an incidental 2 cm sclerotic, well-marginated lesion in the distal femur. Serial radiographs over 2 years demonstrate no change in size or appearance. Which Enneking benign stage best classifies this lesion?

. Stage 1 (Latent)
. Stage 2 (Active)
. Stage 3 (Aggressive)
. Stage IA
. Stage IIA

Correct Answer & Explanation

. Stage 1 (Latent)

Explanation

Enneking Stage 1 describes a latent, benign lesion that is asymptomatic, well-marginated, and inactive. These tumors do not grow, are entirely contained within bone, and typically require only observation.

Question 1203

Topic: 10. Pathology and Oncology

A 22-year-old female presents with progressive pain in her proximal humerus. Radiographs show a 4 cm centrally located lytic lesion with endosteal scalloping and cortical thinning, but an intact cortex. Serial imaging over 6 months confirms slow enlargement. What is the Enneking benign stage?

. Stage 1 (Latent)
. Stage 2 (Active)
. Stage 3 (Aggressive)
. Stage IA
. Stage IB

Correct Answer & Explanation

. Stage 2 (Active)

Explanation

Enneking Stage 2 describes an active benign tumor. It grows slowly, causes symptoms, and may expand the bone with cortical thinning, but it remains contained within an intact cortical envelope.

Question 1204

Topic: 10. Pathology and Oncology
A 35-year-old male presents with severe knee pain. Imaging reveals an expansile, lytic giant cell tumor of the proximal tibia with extensive cortical destruction and a soft tissue mass extending beyond the bone. What is the Enneking benign stage?
. Stage 1 (Latent)
. Stage 2 (Active)
. Stage 3 (Aggressive)
. Stage IIB
. Stage III

Correct Answer & Explanation

. Stage 3 (Aggressive)

Explanation

Enneking Stage 3 describes an aggressive benign tumor. These lesions demonstrate rapid growth, cortical destruction, and soft tissue extension, behaving locally much like a low-grade malignancy.

Question 1205

Topic: 10. Pathology and Oncology
A biopsy confirms a low-grade chondrosarcoma completely confined to the medullary canal of the proximal femur without cortical breach. Staging studies reveal no metastases. What is the appropriate Enneking surgical stage?
. Stage IA
. Stage IB
. Stage IIA
. Stage IIB
. Stage III

Correct Answer & Explanation

. Stage IA

Explanation

Enneking Stage IA corresponds to a low-grade (G1), intracompartmental (T1) malignancy without metastasis (M0). The tumor is entirely confined within the medullary canal (the bone compartment).

Question 1206

Topic: 10. Pathology and Oncology
A 40-year-old female is diagnosed with a low-grade parosteal osteosarcoma of the posterior distal femur. MRI shows the tumor originating on the surface of the bone and extending directly into the popliteal space. No metastases are found. What is the Enneking stage?
. Stage IA
. Stage IB
. Stage IIA
. Stage IIB
. Stage III

Correct Answer & Explanation

. Stage IB

Explanation

Enneking Stage IB represents a low-grade (G1), extracompartmental (T2) tumor without metastasis. The popliteal space is considered an extracompartmental anatomic zone.

Question 1207

Topic: 10. Pathology and Oncology
A 50-year-old male has a high-grade pleomorphic sarcoma entirely contained within the vastus lateralis muscle. MRI confirms the tumor does not breach the fascial boundaries of the anterior compartment of the thigh. No metastases are noted. What is the Enneking stage?
. Stage IA
. Stage IB
. Stage IIA
. Stage IIB
. Stage III

Correct Answer & Explanation

. Stage IIA

Explanation

Enneking Stage IIA corresponds to a high-grade (G2), intracompartmental (T1) tumor with no metastasis. The tumor's confinement within the fascial boundaries of a single muscle compartment makes it T1.

Question 1208

Topic: 10. Pathology and Oncology
A 14-year-old male has a biopsy-proven high-grade osteosarcoma of the distal femur. MRI shows the tumor has completely breached the anterior cortex and extends into the overlying quadriceps muscle. No metastases are present. What is the Enneking stage?
. Stage IA
. Stage IB
. Stage IIA
. Stage IIB
. Stage III

Correct Answer & Explanation

. Stage IIB

Explanation

Enneking Stage IIB describes a high-grade (G2), extracompartmental (T2) tumor without metastasis. Once a primary bone tumor breaches the cortex into the surrounding soft tissue, it is considered extracompartmental.

Question 1209

Topic: 10. Pathology and Oncology
A 22-year-old female presents with a low-grade parosteal osteosarcoma of the distal femur extending into the popliteal space. Staging CT of the chest reveals three small pulmonary metastases. What is the Enneking stage?
. Stage IB
. Stage IIA
. Stage IIB
. Stage III
. Stage IV

Correct Answer & Explanation

. Stage III

Explanation

Enneking Stage III includes any malignant musculoskeletal tumor (any grade, any local extent) that has regional or distant metastasis (M1). The Enneking system does not use a Stage IV classification.

Question 1210

Topic: 10. Pathology and Oncology
During the staging of a high-grade osteosarcoma of the distal femur, an MRI reveals a separate, distinct focus of tumor in the proximal femoral diaphysis separated by normal intervening marrow. According to the Enneking system, how does this affect staging?
. It makes the tumor extracompartmental (T2), classifying it as Stage IIB.
. It classifies the tumor as multicentric, making it Stage IIA.
. It is considered a skip metastasis (M1 equivalent), classifying it as Stage III.
. It does not change the stage as long as it remains within the same bone.
. It changes the histologic grade of the tumor to G3.

Correct Answer & Explanation

. It is considered a skip metastasis (M1 equivalent), classifying it as Stage III.

Explanation

In the Enneking staging system, skip metastases are discrete tumor nodules within the same bone or compartment but separated by normal tissue. They are classified as systemic dissemination (M1 equivalent), automatically making it a Stage III lesion.

Question 1211

Topic: 10. Pathology and Oncology

A surgeon performs an excision of a soft tissue mass. The pathology report indicates the dissection plane passed directly through the reactive zone and pseudocapsule surrounding the tumor, leaving the gross tumor intact but lacking a cuff of normal tissue. What is this surgical margin?

. Intralesional
. Marginal
. Wide
. Radical
. Compartmental

Correct Answer & Explanation

. Marginal

Explanation

A marginal margin is achieved when the dissection plane passes through the reactive zone or pseudocapsule. While the gross tumor is removed en bloc, microscopic satellite lesions often remain in the reactive tissue.

Question 1212

Topic: 10. Pathology and Oncology

A surgeon intends to perform a wide resection of a high-grade soft tissue sarcoma. During dissection, the tumor pseudocapsule is inadvertently breached, exposing gross tumor tissue, which is subsequently removed. What surgical margin has ultimately been achieved?

. Intralesional
. Marginal
. Wide
. Radical
. Contaminated Wide

Correct Answer & Explanation

. Intralesional

Explanation

An intralesional margin occurs when the dissection plane passes directly through the tumor mass itself. Breaching the pseudocapsule and exposing gross tumor intraoperatively defaults the margin to intralesional, carrying a high risk of local recurrence.

Question 1213

Topic: 10. Pathology and Oncology

A wide surgical margin in orthopedic oncology is strictly defined by dissection through which of the following tissues?

. Directly through the macroscopic tumor mass
. Through the pseudocapsule and inflammatory reactive zone
. Through normal tissue, keeping the reactive zone completely intact
. Excision of the entire anatomic compartment containing the tumor from origin to insertion
. Through the joint space adjacent to the involved bone

Correct Answer & Explanation

. Through normal tissue, keeping the reactive zone completely intact

Explanation

A wide margin requires the tumor, its pseudocapsule, and the entire reactive zone to be removed en bloc, surrounded by a continuous cuff of normal tissue. Dissection must not enter the reactive zone.

Question 1214

Topic: 10. Pathology and Oncology

A surgeon performs a limb-salvage resection for a high-grade soft tissue sarcoma in the anterior compartment of the thigh. The pathology report notes that the tumor is surrounded by a continuous cuff of normal muscle tissue, but the entire anterior compartment was not removed. Which of the following best describes this surgical margin?

. Intralesional
. Marginal
. Wide
. Radical
. Contaminated

Correct Answer & Explanation

. Wide

Explanation

A wide margin is achieved when the tumor is resected with a continuous cuff of normal tissue but within the same anatomic compartment. A radical margin would require the removal of the entire compartment from origin to insertion.

Question 1215

Topic: 10. Pathology and Oncology
A 15-year-old female presents with distal femur pain. Imaging reveals a destructive lesion breaching the posterior cortex and extending into the popliteal fossa. Biopsy confirms a high-grade osteosarcoma. Chest CT reveals a 1 cm pulmonary nodule confirmed as metastasis. What is the Enneking surgical stage?
. IIA
. IIB
. III
. IV
. Aggressive

Correct Answer & Explanation

. III

Explanation

The Enneking staging system designates any musculoskeletal sarcoma with regional or distant metastasis as Stage III. This is regardless of local tumor grade or compartmentalization.

Question 1216

Topic: 10. Pathology and Oncology

According to the Enneking surgical staging system for benign musculoskeletal tumors, which of the following best characterizes a Stage 3 (aggressive) lesion?

. Static growth with a thick sclerotic rim
. Growth confined entirely within the native bone cortex
. Penetration of the cortical bone with soft tissue extension
. Low-grade malignant cells on histology
. The presence of skip metastases

Correct Answer & Explanation

. Penetration of the cortical bone with soft tissue extension

Explanation

Benign Stage 3 (aggressive) tumors typically exhibit rapid growth, cortical destruction, and soft tissue extension. They are locally aggressive but lack malignant histologic features.

Question 1217

Topic: 10. Pathology and Oncology

A surgeon performs an excisional biopsy of a subcutaneous mass. The pathology report notes the dissection plane passed directly through the pseudocapsule and reactive zone of the tumor. Which of the following surgical margins has been achieved?

. Intralesional
. Marginal
. Wide
. Radical
. Extracompartmental

Correct Answer & Explanation

. Marginal

Explanation

A marginal excision passes through the pseudocapsule or reactive zone surrounding the tumor. This margin frequently leaves behind microscopic satellite lesions, resulting in high local recurrence rates if no adjuvant therapy is utilized.

Question 1218

Topic: 10. Pathology and Oncology
A 45-year-old male has a high-grade pleomorphic sarcoma localized entirely within the vastus lateralis muscle, with no fascial breach and no metastases. According to the Enneking staging system for malignant tumors, what is the stage of this lesion?
. IA
. IB
. IIA
. IIB
. III

Correct Answer & Explanation

. IIA

Explanation

The tumor is high-grade (Stage II) and intracompartmental (A), making it an Enneking Stage IIA lesion. There is no extracompartmental extension (which would be IIB) or metastasis (Stage III).

Question 1219

Topic: 10. Pathology and Oncology

Which of the following anatomic locations is considered inherently extracompartmental in the Enneking staging system?

. Anterior compartment of the thigh
. Intra-articular space of the knee
. Popliteal fossa
. Posterior compartment of the leg
. Medial compartment of the thigh

Correct Answer & Explanation

. Popliteal fossa

Explanation

Anatomic zones lacking distinct fascial boundaries, such as the popliteal fossa, axilla, femoral triangle, and paraspinal spaces, are inherently extracompartmental. Tumors arising here are designated as 'B' lesions.

Question 1220

Topic: 10. Pathology and Oncology

A 30-year-old patient undergoes resection of a recurrent giant cell tumor of the proximal tibia. The surgeon performs a meticulous curettage, utilizing a high-speed burr and phenol. Despite these adjuvants, what is the true physical surgical margin achieved by the curettage itself?

. Intralesional
. Marginal
. Wide
. Radical
. Extralesional

Correct Answer & Explanation

. Intralesional

Explanation

Curettage is inherently an intralesional procedure because the surgical plane passes directly through the tumor tissue. Adjuvants extend the zone of necrosis to mimic a wider margin functionally, but the physical surgical margin remains intralesional.

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