Patient Presents With Skin Mass on Shoulder

Patient Presents With Skin Mass on Shoulder

August 17, 2017

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?