Patient Presents With Skin Mass on Shoulder

A 48-year-old man presents with a skin mass on his left shoulder, and a biopsy is performed. What is your diagnosis?

A 48-year-old man presents with a skin mass on his left shoulder, and a biopsy is performed.

Based on the image shown, what is your diagnosis?

A. Extraskeletal osteosarcoma

B. Extraskeletal chondrosarcoma

C. Chordoma

D. Melanoma with bone metaplasia

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