This education series for dermatologists is presented by the Weill Cornell Comprehensive Dermatopathology Service.
Case: A 58-year-old man with a history of myelofibrosis presented with a cystic nodule on his left knee. The papulocystic lesion had been present for 2 months and would periodically drain, although there would invariably be a recollection of fluid. He had had a stem cell transplant previously. Also of interest, in November 2018, he was diagnosed with fusarium and had received 6 weeks of amphotericin. A biopsy was performed.
What is the best diagnosis?
C. Limited cutaneous Wegener granulomatosis
D. Superficial granulomataous pyoderma gangrenosum
E. Kerion celsi