27-Year-Old Man Presents With an Anterior Mediastinal Mass

October 14, 2014

A 27-year-old man is found to have an anterior mediastinal mass. A biopsy of the mass is performed. What is your diagnosis?

A 27-year-old man is found to have an anterior mediastinal mass. A biopsy of the mass is performed, and the histology image is shown below.

What is your diagnosis?