A 16-year-old boy presents with recurrent epistaxis and nasal obstruction. Examination reveals a mass in the nasopharynx. Imaging shows a hypervascular lesion originating from the sphenoid sinus region. Which of the following is NOT a characteristic feature of nasopharyngeal angiofibroma?

Explanation

## Nasopharyngeal Angiofibroma: Clinical Profile **Key Point:** Nasopharyngeal angiofibroma (NAF) is a benign but highly vascular tumor that occurs almost exclusively in adolescent males, NOT females. This is a critical distinguishing feature. ### Epidemiology & Demographics - **Age of presentation:** 10–25 years (peak: 15–18 years) - **Sex predominance:** Overwhelmingly male (ratio ~20:1 male to female) - **Unilateral presentation:** Correct — typically presents with unilateral nasal obstruction and epistaxis **High-Yield:** The strong male predominance is a cardinal feature and frequently tested. Female presentation is exceptionally rare and should prompt consideration of alternative diagnoses. ### Origin & Anatomy | Feature | Detail | | --- | --- | | **Site of origin** | Pterygoid fossa, near the sphenopalatine foramen | | **Embryologic source** | Ectoderm of the nasal capsule (not neural crest) | | **Growth pattern** | Slow but progressive; extends into nasopharynx, nasal cavity, and paranasal sinuses | ### Pathological Characteristics 1. **Benign nature:** Despite being benign, it is locally aggressive 2. **Highly vascular:** Extensive network of feeding vessels (primarily from sphenopalatine artery) 3. **Recurrence:** High recurrence rate (10–30%) if incompletely excised; requires wide local excision with adequate margins ### Imaging & Angiography **Clinical Pearl:** Angiography is the gold standard for preoperative assessment and shows: - Characteristic tumor blush (intense enhancement) - Multiple feeding vessels (sphenopalatine, internal maxillary, ascending pharyngeal arteries) - Venous lakes and early venous drainage ### Why Option 3 is Incorrect NAF presents almost exclusively in **adolescent males**, not females. This is a fundamental epidemiological fact that distinguishes NAF from other nasopharyngeal masses (e.g., lymphomas, carcinomas, which can occur in either sex across broader age ranges). [cite:Dhingra's Diseases of Ear Nose and Throat Ch 15]