Nasopharyngeal Angiofibroma

Which of the following features best distinguishes nasopharyngeal angiofibroma (NAF) from nasopharyngeal carcinoma in a 16-year-old boy presenting with epistaxis and nasal obstruction?

Nasopharyngeal angiofibroma arises from which anatomical site?

A 16-year-old boy presents to the ENT clinic with a 6-month history of progressive unilateral nasal obstruction and recurrent epistaxis. His mother reports he has been a mouth-breather and complains of difficulty during sports. On nasal endoscopy, a smooth, glistening, reddish mass is seen in the nasopharynx, extending into the nasal cavity. CT scan shows a well-defined mass with heterogeneous enhancement and bowing of the posterior maxillary wall. Angiography reveals a highly vascular lesion with feeding vessels from the maxillary artery. What is the most likely diagnosis?

A 19-year-old male presents with a 4-month history of progressive nasal obstruction, recurrent epistaxis requiring blood transfusion, and facial pain. Endoscopy reveals a large, bleeding mass in the nasopharynx. CT imaging shows a heterogeneously enhancing mass with widening of the pterygopalatine fossa and erosion of the pterygoid plates. The patient is scheduled for endoscopic resection. What is the most appropriate preoperative intervention to reduce intraoperative hemorrhage?

A 14-year-old boy with recurrent epistaxis and nasal obstruction undergoes CT imaging showing a mass in the nasopharynx with bone erosion. Which imaging feature best distinguishes nasopharyngeal angiofibroma from other benign nasopharyngeal masses (e.g., antrochoanal polyp)?