Question: A 74 year old with poorly controlled diabetes mellitus develops a non healing septal lesion with a perforation at its margin. Biopsy reveals CD56 positive cells and fungal spores. What is the most likely diagnosis?

a) Invasive fungal sinusitis

b) NK/T cell lymphoma

c) Sinonasal undifferentiated carcinoma

d) GPA

[Answer will be posted with next week's new question]

Answer to last week's question, “Hear This" (November 18, 2019)

C - Dorsal cochlear nucleus in the lateral recess of the 4th ventricle.