10. Pathology and Oncology MCQs

A 16-year-old boy presents with a painless, enlarging soft tissue mass in his thigh. A biopsy is performed, revealing a highly cellular malignant spindle cell neoplasm. Molecular genetic analysis identifies a t(X;18)(p11;q11) translocation. What is the most likely diagnosis?

A 16-year-old boy presents with severe, unremitting thigh pain. Radiographs show a permeative, destructive lesion in the diaphysis of the femur with a prominent 'onion-skin' periosteal reaction. Biopsy reveals sheets of uniform, small, round blue cells that strongly stain positive for CD99 (MIC2). Which of the following chromosomal translocations is most characteristically associated with this tumor?

A 28-year-old male presents with a slow-growing, painful mass deep in his left thigh. Magnetic resonance imaging demonstrates a well-circumscribed soft tissue mass adjacent to the knee joint. A core needle biopsy reveals a biphasic histologic pattern comprising both epithelial and spindle cells. Cytogenetic analysis of this tumor is most likely to show which of the following chromosomal translocations?

A 28-year-old man presents with a slowly enlarging, painful mass around his right knee joint, located entirely extra-articularly. Biopsy demonstrates a biphasic tumor with both epithelial and spindle cell components. Which of the following chromosomal translocations is characteristic of this diagnosis?

A 13-year-old girl presents with progressive knee pain for 3 months. Radiographs demonstrate a mixed sclerotic and lytic lesion in the distal femoral metaphysis with a 'sunburst' periosteal reaction. Biopsy confirms high-grade osteosarcoma. What is the current standard treatment protocol for this condition?

A 14-year-old girl presents with progressive knee pain and swelling. Radiographs reveal an eccentric, expansile, purely lytic lesion in the metaphysis of the distal femur. MRI demonstrates characteristic multiple fluid-fluid levels within the lesion. An incisional biopsy reveals blood-filled spaces lacking an endothelial lining, interspersed with multinucleated giant cells and a spindle cell stroma. Which of the following genetic translocations is most commonly associated with this primary pathology?

A 10-year-old girl is evaluated for worsening mid-thigh pain that awakens her at night. Radiographs show a permeative, destructive diaphyseal lesion of the femur with a prominent 'onion skin' periosteal reaction. Core needle biopsy confirms a dense proliferation of uniform, small, round blue cells. Which of the following chromosomal translocations is most characteristic of this malignancy?

A 28-year-old male presents with a deep, slow-growing, painful soft tissue mass in the plantar aspect of his foot. Histopathological examination following core needle biopsy reveals a biphasic pattern consisting of both epithelial-like cells forming glandular structures and a spindle cell stromal component. Cytogenetic analysis is most likely to reveal which of the following specific chromosomal translocations?

A 16-year-old boy presents with a painful, enlarging mass in the diaphysis of the femur. Biopsy reveals uniform, small, round blue cells. Cytogenetic analysis identifies a t(11;22)(q24;q12) chromosomal translocation. Which fusion gene is associated with this patient's diagnosis?

A 25-year-old male presents with a deep, slow-growing, painful mass in his popliteal fossa.

A core needle biopsy is performed. Cytogenetic and molecular analyses reveal a characteristic t(X;18)(p11;q11) chromosomal translocation. Which of the following fusion genes is diagnostic for this patient's condition?

A 28-year-old man presents with a slow-growing, deep, painless mass in the popliteal fossa. MRI reveals a well-circumscribed soft tissue tumor near the knee joint, though it does not communicate with the joint space itself. Figure 5 shows the biopsy results, which demonstrate a biphasic pattern consisting of both epithelial-like glands and surrounding spindle cells. Cytogenetic analysis of this tumor is most likely to reveal which of the following chromosomal translocations?

A 16-year-old male presents with a deep, painful soft-tissue mass in his distal thigh. Core needle biopsy reveals a high-grade spindle cell sarcoma. Molecular and cytogenetic analysis demonstrates a t(X;18)(p11;q11) chromosomal translocation. Which of the following is the most likely diagnosis?

A core biopsy of articular cartilage is analyzed histologically and biochemically. The researcher notes an area characterized by the highest concentration of proteoglycans, the lowest concentration of water, and thick type II collagen fibers oriented perpendicular to the joint surface. Which zone of articular cartilage is being observed?

A 28-year-old male presents with a slowly enlarging, deep soft tissue mass in the posterior thigh. Core needle biopsy reveals a biphasic tumor consisting of both epithelial glandular elements and spindle cell components. Molecular cytogenetic analysis is most likely to reveal which of the following chromosomal translocations?

A researcher is analyzing an articular cartilage biopsy from a 50-year-old patient with early osteoarthritis. When evaluating the structural and biochemical properties of the normal superficial (tangential) zone of articular cartilage, which of the following characteristic findings should be expected?

A 28-year-old male presents with a slow-growing, painful mass near his knee joint. Biopsy reveals a biphasic tumor with both epithelial and spindle cell components. Cytogenetic analysis is most likely to reveal which of the following chromosomal translocations?

A 65-year-old male with a history of widely metastatic renal cell carcinoma presents with progressive bilateral leg weakness and hyperreflexia.

MRI demonstrates an epidural metastatic lesion at T8 causing severe, high-grade spinal cord compression without mechanical instability. The tumor is known to be radioresistant. What is the most appropriate next step in management based on the NOMS framework?

A 60-year-old woman with a history of renal cell carcinoma presents with progressive back pain. MRI shows a metastatic lesion in the T8 vertebral body with high-grade epidural spinal cord compression. She has 4/5 strength in her lower extremities. Her overall life expectancy is estimated to be greater than 1 year. According to the NOMS (Neurologic, Oncologic, Mechanical, Systemic) framework, what is the most appropriate management for this radioresistant tumor?

A 62-year-old male presents with insidious onset of sacral pain and bowel/bladder dysfunction. Imaging reveals a large, destructive midline sacral mass with a 'soap bubble' appearance and an anterior cortical break.

Biopsy demonstrates physaliferous cells. What is the most appropriate definitive management for this lesion?

A 65-year-old man with metastatic prostate cancer presents with progressively worsening midthoracic back pain. Neurologic examination reveals 4/5 strength in bilateral hip flexors and a positive Babinski sign. MRI demonstrates a metastatic lesion at T8 with significant epidural spinal cord compression. His estimated life expectancy is 18 months, and the tumor is considered radioresistant. According to the landmark Patchell criteria and current literature, what is the most appropriate management?