Patient Presents With Knee Mass

A 53-year-old man presents with a mass behind his right knee, and a biopsy is performed. What is your diagnosis?

A 53-year-old man presents with a mass behind his right knee, and a biopsy is performed.

What is your diagnosis?

A. Neurofibroma

B. Synovial sarcoma, monophasic

C. Hurtle cell carcinoma

D. Spindle cell carcinoid

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