Question: A 7 year old male is evaluated for unilateral epistaxis. A large, friable, exophytic mass is visualized on anterior rhinoscopy. CT shows complete opacification of the right nasal cavity with mixed density. Biopsy reveals small round cells and an elevated number of mitoses per high power field. Staining for MyoD1 is positive. What is the most likely diagnosis?

a) Inflammatory nasal polyp

b) Allergic fungal sinusitis

c) Juvenile nasopharyngeal angiofibroma

d) Rhabdomyosarcoma

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

Answer to last week's question, “Technical Difficulties” (April 27, 2020)

A - CT of the temporal bone to determine whether the array is “backing out” of the cochlea.