The patient went on to have surgery.

Histology

MICROSCOPIC DESCRIPTION: Fragments are covered by nasal respiratory type epithelium with underlying mucinous glands. Most of the deeper aspect consists of irregular variably-sized blood vessels within an abundant collagenous haphazardly deposited stroma of varying cellularity and with prominent necrosis. There is some underlying bone with variably-sized vessels some with surrounding smooth muscle which is infiltrating in and around the bone fragments. These latter areas reflect infiltration by juvenile angiofibroma. Intravascular foreign embolic debris is noted. 

FINAL DIAGNOSIS: juvenile nasopharyngeal angiofibroma with focal necrosis. 

It is crucial to recognize these tumors on imaging as a biopsy can be disastrous due to their high vascularity. Preoperative embolization is also important to reduce intraoperative blood loss.