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 1081
Topic: 10. Pathology and Oncology
A 30-year-old female presents with knee pain. Radiographs demonstrate an eccentric, lytic epiphyseal lesion extending to the subchondral bone of the proximal tibia. Biopsy confirms a giant cell tumor of bone. Which targeted medical therapy is most appropriate if the lesion is deemed unresectable?
Correct Answer & Explanation
. Denosumab
Explanation
Denosumab is a monoclonal antibody against RANKL, used for unresectable or recurrent giant cell tumors of bone. It inhibits the osteoclast-like giant cells, leading to tumor ossification and clinical stabilization.
Question 1082
Topic: 10. Pathology and Oncology
A 55-year-old man presents with deep shoulder pain. Radiographs show a large lytic lesion with 'rings and arcs' calcification in the proximal humerus. Biopsy reveals atypical chondrocytes with binucleation and myxoid stroma. What is the primary treatment for this condition?
Correct Answer & Explanation
. Wide surgical resection alone
Explanation
Conventional chondrosarcomas are notably resistant to both chemotherapy and radiation. Wide surgical excision with negative margins is the definitive mainstay of treatment for intermediate and high-grade lesions.
Question 1083
Topic: Bone Tumors
A 19-year-old male complains of severe, nocturnal thigh pain that is completely relieved by ibuprofen. A CT scan demonstrates a 7 mm radiolucent nidus surrounded by dense sclerotic bone in the femoral diaphysis. What is the most appropriate minimally invasive definitive treatment?
Correct Answer & Explanation
. Radiofrequency ablation
Explanation
Radiofrequency ablation (RFA) is the standard minimally invasive treatment for osteoid osteoma. It offers excellent clinical success rates, rapid pain relief, and minimal morbidity compared to open surgical excision.
Question 1084
Topic: 10. Pathology and Oncology
A 60-year-old woman with breast cancer presents with progressive thigh pain. Radiographs show a 1 cm completely lytic lesion in the peritrochanteric region of the femur involving 20 percent of the cortical diameter. She experiences moderate pain specifically with weight-bearing. What is her Mirels score, and what is the recommendation?
Correct Answer & Explanation
. Score 10, prophylactic fixation
Explanation
The Mirels score points are: Peritrochanteric site (3), functional pain (3), lytic lesion (3), and size less than 1/3 (1), totaling 10. A score of 9 or higher indicates a high risk of impending fracture and warrants prophylactic surgical fixation.
Question 1085
Topic: 10. Pathology and Oncology
A 15-year-old boy presents with progressive distal thigh pain. Radiographs demonstrate a destructive metaphyseal lesion of the distal femur with a 'sunburst' periosteal reaction. Biopsy confirms high-grade intramedullary osteosarcoma. What is the most appropriate treatment algorithm?
Correct Answer & Explanation
. Neoadjuvant chemotherapy, wide surgical resection, and adjuvant chemotherapy
Explanation
The standard of care for high-grade osteosarcoma includes neoadjuvant chemotherapy, wide surgical resection, and adjuvant chemotherapy. This approach allows evaluation of the tumor's histologic response to chemotherapy, which guides postoperative medical management.
Question 1086
Topic: 10. Pathology and Oncology
A 12-year-old boy presents with thigh pain and low-grade fever. Radiographs show a permeative diaphyseal lesion in the femur with 'onion-skin' periosteal reaction. Which of the following genetic translocations is most characteristic of this diagnosis?
Correct Answer & Explanation
. t(11;22)
Explanation
Ewing sarcoma is classically associated with the t(11;22) translocation, which results in the EWS-FLI1 fusion gene. This chromosomal abnormality is present in approximately 85% of Ewing sarcoma cases.
Question 1087
Topic: 10. Pathology and Oncology
A 65-year-old male with a history of renal cell carcinoma presents with progressive groin pain. Radiographs reveal a large, impending pathologic fracture of the proximal femur. Before proceeding with prophylactic intramedullary nailing, what is the most appropriate next step in management?
Correct Answer & Explanation
. Preoperative selective arterial embolization
Explanation
Metastatic bone lesions from renal cell carcinoma and thyroid cancer are highly vascular. Preoperative selective arterial embolization within 24 to 48 hours of surgery is critical to minimize life-threatening intraoperative blood loss.
Question 1088
Topic: 10. Pathology and Oncology
A 58-year-old male presents with deep, aching pelvic pain. Radiographs show a large destructive lesion in the ilium with 'rings and arcs' calcification. Biopsy confirms a grade II chondrosarcoma. What is the standard of care for this lesion?
Correct Answer & Explanation
. Wide surgical resection
Explanation
Conventional chondrosarcomas are generally resistant to both chemotherapy and radiation therapy. The standard of care for an intermediate- to high-grade (Grade II/III) conventional chondrosarcoma in the pelvis is wide surgical excision with negative margins.
Question 1089
Topic: Bone Tumors
A 19-year-old male complains of right shin pain that is significantly worse at night and rapidly relieved by ibuprofen. Radiographs demonstrate cortical thickening in the tibial diaphysis with a 1 cm radiolucent nidus. What is the most commonly utilized minimally invasive definitive treatment?
Correct Answer & Explanation
. Radiofrequency ablation
Explanation
The clinical and radiographic presentation is classic for an osteoid osteoma. Radiofrequency ablation (RFA) is currently the treatment of choice for lesions that fail medical management, offering a high success rate and rapid recovery.
Question 1090
Topic: 10. Pathology and Oncology
A 58-year-old male presents with a 12 cm, firm, deep-seated mass in his posterior thigh that has been slowly growing over the past 18 months. He reports occasional dull ache but no specific neurological symptoms. Physical examination reveals a non-mobile, firm mass. Which of the following clinical characteristics is the MOST concerning for a potential liposarcoma rather than a benign lipoma?
Correct Answer & Explanation
. Its deep-seated location and size greater than 5 cm.
Explanation
Correct Answer: DAcademic RationaleThe most concerning clinical features for a potential liposarcoma, as opposed to a benign lipoma, are itsdeep-seated location and size greater than 5 cm. While benign lipomas can be large, a deep location (e.g., intramuscular or subfascial) significantly increases the suspicion for malignancy. A size greater than 5 cm is a commonly cited threshold that warrants further investigation for soft tissue masses. Progressive growth, even if slow, is also a red flag.A. The presence of occasional dull ache:While pain can be a symptom of malignancy, it is not a specific or highly sensitive indicator. Benign lipomas, especially angiolipomas or those causing mass effect on nerves, can also be painful.B. The mass being non-mobile on physical examination:Non-mobility or fixation to deeper structures is concerning, as it suggests infiltration, which is more characteristic of malignancy. However, a deep-seated mass, even if benign, might feel less mobile than a superficial one. The combination with size and depth is more critical.C. Slow growth over 18 months:Slow growth can occur with low-grade sarcomas, such as well-differentiated liposarcomas. However, any progressive growth, especially in a deep and large mass, is concerning. Rapid growth is a stronger indicator of high-grade malignancy, but slow growth does not rule out a low-grade sarcoma.E. Absence of specific neurological symptoms:The absence of neurological symptoms does not rule out malignancy. Many sarcomas, especially in early stages or in locations not directly impinging on nerves, are asymptomatic or cause only vague discomfort.Therefore, the combination of deep location and large size is the most critical alarm bell in this scenario.
Question 1091
Topic: 10. Pathology and Oncology
A 48-year-old female presents with a 9 cm fatty mass in her anterior thigh. MRI reveals a well-circumscribed lesion with uniform high signal intensity on T1-weighted images, identical to subcutaneous fat. However, there are also several internal septations, some measuring 3 mm in thickness, which show mild enhancement after gadolinium administration. There are no discrete non-adipose nodules. What is the most appropriate interpretation of these MRI findings?
Correct Answer & Explanation
. Highly suspicious for an atypical lipomatous tumor (ALT) / well-differentiated liposarcoma (WDLPS).
Explanation
Correct Answer: CAcademic RationaleWhile uniform fat signal is characteristic of a benign lipoma, the presence of internal septations, particularly if they arethick (>2mm) and enhancing, significantly raises suspicion for atypical lipomatous tumor (ALT) / well-differentiated liposarcoma (WDLPS). Benign lipomas typically have thin (<2mm), non-enhancing septa or no septa at all. The size of the lesion (9 cm) also adds to the concern, as larger fatty masses are more likely to be liposarcomas.A. Consistent with a benign lipoma, requiring no further action:This is incorrect. The enhancing thick septa are a red flag that differentiates this from a classic benign lipoma.B. Suggestive of a necrotic lipoma, requiring observation:Necrotic lipomas are rare and would typically show different imaging characteristics, such as fluid collections or gas, and observation is not appropriate for a suspicious mass.D. Indeterminate, but most likely a benign lipoma with atypical features:While it is technically indeterminate without biopsy, the imaging features are strong enough to classify it as 'highly suspicious' for ALT/WDLPS, necessitating further workup (biopsy).E. Characteristic of a myxoid liposarcoma:Myxoid liposarcomas typically have a significant non-fatty, myxoid component that appears as high signal on T2-weighted images and shows enhancement, often with a characteristic plexiform vascular pattern. While they can contain fat, the primary description here of a predominantly fatty mass with enhancing septa points more towards WDLPS/ALT.Therefore, the combination of size, deep location (implied by thigh mass), and especially the thick, enhancing septa makes ALT/WDLPS the most likely diagnosis.
Question 1092
Topic: 10. Pathology and Oncology
A core needle biopsy of a deep-seated fatty mass in the retroperitoneum reveals mature adipocytes with mild nuclear atypia and scattered atypical stromal cells. Immunohistochemical staining shows strong nuclear positivity for MDM2 and CDK4. These findings are most consistent with which diagnosis?
Correct Answer & Explanation
. Well-differentiated liposarcoma (WDLPS).
Explanation
Correct Answer: DAcademic RationaleThe histological findings of mature adipocytes with mild nuclear atypia and scattered atypical stromal cells are characteristic of a well-differentiated liposarcoma (WDLPS). The key diagnostic confirmation comes from thestrong nuclear positivity for MDM2 and CDK4. Amplification of the MDM2 and CDK4 genes, located on chromosome 12q13-15, is the hallmark genetic alteration found in WDLPS and atypical lipomatous tumor (ALT). This genetic marker is critical for distinguishing WDLPS/ALT from benign lipomas, which lack these amplifications.A. Benign lipoma with reactive changes:Benign lipomas do not exhibit significant nuclear atypia or atypical stromal cells, nor do they show MDM2/CDK4 amplification.B. Hibernoma:Hibernomas are benign tumors of brown fat, characterized by multivacuolated adipocytes with granular eosinophilic cytoplasm, and do not show MDM2/CDK4 amplification.C. Myxoid liposarcoma:Myxoid liposarcomas are characterized by a prominent myxoid matrix, a delicate plexiform capillary network, and primitive round/spindle cells, often with FUS-DDIT3 fusion gene, not MDM2/CDK4 amplification.E. Dedifferentiated liposarcoma (DDLPS):DDLPS is defined by the coexistence of a WDLPS component with a distinct, non-lipogenic, high-grade sarcomatous component. While it originates from WDLPS and would therefore also show MDM2/CDK4 amplification, the biopsy description does not mention a high-grade non-lipogenic component. The findings described are purely those of the well-differentiated component.Given the specific histological and immunohistochemical findings, WDLPS is the most accurate diagnosis.
Question 1093
Topic: 10. Pathology and Oncology
A 65-year-old male is diagnosed with a large, retroperitoneal well-differentiated liposarcoma (WDLPS) after an extensive workup. What is the primary concern regarding the behavior and prognosis of this tumor, specifically due to its retroperitoneal location?
Correct Answer & Explanation
. Significant potential for dedifferentiation and high local recurrence rates.
Explanation
Correct Answer: CAcademic RationaleRetroperitoneal liposarcomas, even those histologically classified as well-differentiated (WDLPS), have a significantly different biological behavior and prognosis compared to their extremity counterparts (where they are termed Atypical Lipomatous Tumors, ALT). In the retroperitoneum, WDLPS has a high propensity forlocal recurrence and, more significantly, for dedifferentiation into a higher-grade sarcoma. This dedifferentiation confers metastatic potential and significantly worsens prognosis. The anatomical constraints of the retroperitoneum also make achieving wide, negative surgical margins challenging, further contributing to high local recurrence rates.A. High risk of distant metastasis to the lungs:While dedifferentiated liposarcomas (DDLPS) do have metastatic potential, WDLPS itself does not metastasize unless it dedifferentiates. The primary concern for retroperitoneal WDLPS is dedifferentiation, which then leads to metastatic risk.B. Low risk of local recurrence after complete excision:This is incorrect. Retroperitoneal WDLPS has a very high local recurrence rate due to its infiltrative nature and the difficulty of achieving wide margins in this anatomical space.D. High sensitivity to systemic chemotherapy, making it the primary treatment:WDLPS is generally not highly sensitive to conventional chemotherapy. Aggressive surgical resection is the cornerstone of treatment.E. Rapid growth leading to early symptoms and easy detection:Retroperitoneal sarcomas often grow to very large sizes before causing symptoms due to the expansive nature of the retroperitoneal space, making early detection challenging.Therefore, the potential for dedifferentiation and high local recurrence are the primary concerns for retroperitoneal WDLPS.
Question 1094
Topic: 10. Pathology and Oncology
A 35-year-old patient presents with a 7 cm, deep-seated, firm mass in the popliteal fossa. A core needle biopsy reveals a tumor composed of primitive round and spindle cells within an abundant myxoid stroma, associated with a delicate plexiform capillary network. Lipoblasts are present. Which of the following is the most appropriate initial treatment strategy for this patient?
Correct Answer & Explanation
. Neoadjuvant chemotherapy and/or radiotherapy followed by wide local excision.
Explanation
Correct Answer: CAcademic RationaleThe histological description (primitive round/spindle cells, myxoid stroma, plexiform capillary network, lipoblasts) is classic formyxoid liposarcoma. Myxoid liposarcoma, particularly when deep-seated and large (7 cm), is a high-grade sarcoma that is recognized for its relative sensitivity to both chemotherapy and radiotherapy. Therefore, a multidisciplinary approach involvingneoadjuvant (pre-operative) chemotherapy and/or radiotherapy followed by wide local excisionis the most appropriate initial treatment strategy.A. Observation with serial imaging due to its low-grade nature:This is incorrect. Myxoid liposarcoma is a malignant tumor with metastatic potential, and observation is not appropriate.B. Primary amputation due to the critical location:While the popliteal fossa is a critical anatomical area, limb salvage is the goal for most sarcomas. Neoadjuvant therapy can often shrink the tumor and facilitate a limb-sparing wide local excision. Amputation is reserved for cases where limb salvage is not feasible or would result in a non-functional limb.D. Marginal excision with careful follow-up:Marginal excision is inadequate for a sarcoma and would lead to a very high local recurrence rate. Wide local excision with negative margins is required.E. Intralesional corticosteroid injection for symptomatic relief:This is an inappropriate treatment for a malignant tumor.Neoadjuvant therapy aims to improve resectability, achieve better margins, and potentially address micrometastatic disease, making it the preferred initial approach for this type of tumor.
Question 1095
Topic: 10. Pathology and Oncology
A 50-year-old patient undergoes resection of a large retroperitoneal fatty tumor. Histopathological examination reveals areas of well-differentiated liposarcoma (WDLPS) alongside a distinct, high-grade, non-lipogenic sarcomatous component resembling an undifferentiated pleomorphic sarcoma. What is the most accurate statement regarding the prognosis and metastatic potential of this specific tumor subtype?
Correct Answer & Explanation
. It carries a high risk of local recurrence and significant distant metastatic potential.
Explanation
Correct Answer: CAcademic RationaleThe description of a well-differentiated liposarcoma (WDLPS) component coexisting with a distinct, high-grade, non-lipogenic sarcomatous component (e.g., undifferentiated pleomorphic sarcoma-like) is the definition of adedifferentiated liposarcoma (DDLPS). DDLPS is an aggressive subtype of liposarcoma, particularly common in the retroperitoneum. It carries ahigh risk of local recurrencedue to its infiltrative nature and the difficulty of achieving wide margins in the retroperitoneum. Crucially, the dedifferentiated component conferssignificant distant metastatic potential, primarily to the lungs, but also to other sites. This makes its prognosis considerably worse than that of WDLPS/ALT.A. It has a low risk of local recurrence and no metastatic potential:This describes a well-excised ALT in an extremity, not DDLPS.B. It is a benign tumor with a high chance of spontaneous regression:This is entirely incorrect; DDLPS is a high-grade malignancy.D. It is highly sensitive to chemotherapy, which is curative as a monotherapy:DDLPS is generally resistant to conventional chemotherapy as a monotherapy, though chemotherapy may be used in a neoadjuvant or adjuvant setting. Aggressive surgical resection is the cornerstone of treatment.E. Its prognosis is similar to a benign lipoma, regardless of size:This is incorrect. DDLPS is a high-grade malignancy with a guarded prognosis.Therefore, the presence of dedifferentiation significantly worsens the prognosis, primarily due to increased local recurrence and metastatic risk.
Question 1096
Topic: 10. Pathology and Oncology
A 40-year-old patient presents with a small (2 cm), firm, tender subcutaneous nodule on her forearm that has been present for several months and is mildly painful to palpation. MRI shows a well-circumscribed fatty lesion with a prominent vascular component. Which benign fatty tumor variant is most consistent with this presentation?
Correct Answer & Explanation
. Angiolipoma
Explanation
Correct Answer: DAcademic RationaleThe key distinguishing feature in this clinical vignette is thepainful and tender natureof the subcutaneous fatty nodule, combined with the MRI finding of aprominent vascular component. This presentation is classic for anangiolipoma. Angiolipomas are benign lipomatous tumors characterized by a significant proliferation of mature capillary-sized vessels within the adipose tissue, which is thought to contribute to their characteristic tenderness or pain.A. Conventional lipoma:These are typically soft, mobile, and painless.B. Hibernoma:These are rare tumors of brown fat, usually painless, and found in specific locations like the neck, axilla, or mediastinum.C. Spindle cell lipoma:These are benign tumors characterized by mature adipocytes and uniform spindle cells. They are typically painless and found in the posterior neck, shoulder, and back of older men.E. Pleomorphic lipoma:These are benign tumors characterized by mature adipocytes, spindle cells, and characteristic 'floret-type' giant cells. They are typically painless and found in similar locations to spindle cell lipomas.Therefore, the combination of pain/tenderness and a prominent vascular component on imaging strongly points to angiolipoma.
Question 1097
Topic: 10. Pathology and Oncology
A 68-year-old male is diagnosed with a 10 cm high-grade pleomorphic liposarcoma of the proximal thigh. He has no palpable lymphadenopathy. Which of the following imaging modalities is most crucial for initial systemic staging to detect potential distant metastases?
Correct Answer & Explanation
. CT scan of the chest, abdomen, and pelvis.
Explanation
Correct Answer: CAcademic RationaleFor a newly diagnosed high-grade soft tissue sarcoma, such as a pleomorphic liposarcoma, the most common site of distant metastasis is the lungs. Therefore, aCT scan of the chestis crucial for detecting pulmonary metastases. Given the size and high-grade nature, a CT scan of theabdomen and pelvisis also typically included to screen for other potential visceral metastases, especially if the primary tumor is large or located in the trunk. This comprehensive cross-sectional imaging provides the most critical information for systemic staging.A. Regional lymph node ultrasound:Lymph node metastases are uncommon in most soft tissue sarcomas, including liposarcoma (with the exception of epithelioid sarcoma and rhabdomyosarcoma). Therefore, routine regional lymph node dissection or extensive imaging is not typically indicated unless there is palpable lymphadenopathy.B. Bone scan (Technetium-99m):Bone scans are primarily used to detect bone metastases. While some sarcomas (e.g., myxoid liposarcoma) can metastasize to bone, it is less common than lung metastasis, and a bone scan is usually reserved for cases with bone pain or suspicious findings on other imaging.D. Comprehensive blood work including tumor markers:Tumor markers are generally not reliable or specific for the diagnosis or staging of soft tissue sarcomas.E. MRI of the brain:Brain metastases are rare for most soft tissue sarcomas, except for specific subtypes like high-grade myxoid liposarcoma. It is not part of routine initial staging for pleomorphic liposarcoma unless there are neurological symptoms.Thus, CT of the chest, abdomen, and pelvis is the most appropriate and crucial initial systemic staging modality.
Question 1098
Topic: 10. Pathology and Oncology
A patient undergoes wide local excision for a high-grade liposarcoma of the thigh. The final pathology report indicates a positive surgical margin (R1 resection). What is the most significant implication of this finding for the patient's prognosis?
Correct Answer & Explanation
. Significantly increased risk of local recurrence.
Explanation
Correct Answer: CAcademic RationaleMargin status is consistently the most critical factor influencing local recurrence rates for all types of soft tissue sarcomas, including liposarcomas. Apositive surgical margin (R1 resection), meaning microscopic tumor cells are present at the edge of the resected specimen, is a strong predictor ofsignificantly increased risk of local recurrence. Achieving negative surgical margins (R0 resection) is paramount for local disease control.A. Increased risk of distant metastasis:While positive margins can be associated with a worse overall prognosis, their primary impact is on local control. Distant metastasis is more strongly correlated with tumor grade, size, and histological subtype.B. Necessity for immediate primary amputation:Amputation is a drastic measure and is not automatically indicated for a positive margin. Re-excision to achieve negative margins, often combined with adjuvant radiotherapy, is the standard approach.D. Indication for systemic chemotherapy as the sole adjuvant treatment:Chemotherapy is generally used for systemic disease or to improve resectability, but it is not a substitute for local control measures like re-excision or radiotherapy for positive margins. Adjuvant radiotherapy is often indicated for positive margins.E. No significant impact on long-term survival if the tumor was small:Even for smaller tumors, positive margins significantly increase the risk of local recurrence, which can compromise limb function and potentially lead to further morbidity or mortality if subsequent recurrences are more aggressive or difficult to treat.Therefore, a positive surgical margin is primarily a predictor of local failure.
Question 1099
Topic: 10. Pathology and Oncology
A 30-year-old male presents with chronic, painless knee swelling. MRI reveals a diffuse, villous, frond-like proliferation of the synovial membrane within the joint, particularly prominent in the suprapatellar pouch. The proliferating tissue demonstrates signal characteristics identical to subcutaneous fat on all sequences. What is the most likely diagnosis?
Correct Answer & Explanation
. Lipoma arborescens
Explanation
Correct Answer: CAcademic RationaleThe MRI findings of adiffuse, villous, frond-like proliferation of the synovial membrane with signal characteristics identical to subcutaneous fatare pathognomonic forlipoma arborescens. This is a rare, benign condition characterized by a diffuse lipomatous (fatty) infiltration of the synovial membrane, most commonly affecting the knee joint, particularly the suprapatellar pouch.A. Synovial chondromatosis:This involves cartilaginous metaplasia of the synovium, leading to loose bodies that are typically low signal on T1 and T2 (unless calcified) and do not demonstrate fat signal.B. Pigmented villonodular synovitis (PVNS):PVNS is characterized by synovial proliferation with hemosiderin deposition, which typically appears as very low signal intensity on all MRI sequences (especially T2* gradient echo) due to susceptibility artifact, not fat signal.D. Rheumatoid arthritis:This is an inflammatory arthritis characterized by synovial hypertrophy, pannus formation, and joint effusions, but the synovial tissue itself does not show fat signal intensity.E. Intra-articular lipoma:An intra-articular lipoma is a benign, circumscribed collection of mature adipose tissue located within the joint capsule but typically external to the synovium, or as a localized mass within the synovium, not a diffuse villous proliferation of the entire synovial membrane.The diffuse villous fatty proliferation of the synovium is the key to diagnosing lipoma arborescens.
Question 1100
Topic: 10. Pathology and Oncology
A 55-year-old patient is undergoing workup for a soft tissue mass. The orthopedic oncologist emphasizes the importance of performing a core needle biopsy rather than an excisional biopsy for any suspicious lesion. What is the primary reason for this recommendation?
Correct Answer & Explanation
. Core needle biopsy minimizes contamination of tissue planes, preserving options for definitive limb-salvage surgery.
Explanation
Correct Answer: CAcademic RationaleThe primary reason for preferring acore needle biopsyover an excisional biopsy for a suspicious soft tissue mass is tominimize contamination of tissue planes and preserve options for definitive limb-salvage surgery. An excisional biopsy, if performed without oncologic principles, can spread tumor cells into surrounding healthy tissues, creating a contaminated field that makes subsequent wide local excision more challenging and potentially compromises the ability to achieve clear margins or even necessitates a more extensive resection (e.g., amputation).A. Core needle biopsy provides a larger tissue sample for diagnosis:While core needle biopsy provides sufficient tissue for diagnosis, excisional biopsy typically provides a larger sample. However, the quality and strategic placement of the biopsy are more important than sheer volume.B. Excisional biopsy is more painful and requires general anesthesia:While excisional biopsy is a more invasive procedure and often requires more robust anesthesia, this is not the primary oncologic reason for avoiding it.D. Core needle biopsy offers real-time pathological diagnosis during the procedure:Real-time diagnosis (frozen section) can be performed with either biopsy type, but it's not a unique advantage of core needle biopsy. Definitive diagnosis often requires permanent sections and ancillary studies.E. Excisional biopsy has a higher risk of infection compared to core needle biopsy:While any surgical procedure carries infection risk, the difference in infection rates between the two, while present, is not the main oncologic driver for the preference.The strategic placement of a core needle biopsy tract, along the axis of the planned definitive incision, is crucial for minimizing the impact on future surgical fields.
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