A 28-year-old woman with a 2-week history of unilateral epistaxis is found to have a mass in the nasopharynx on nasal endoscopy. Which clinical feature best distinguishes nasopharyngeal angiofibroma from nasopharyngeal carcinoma as a cause of epistaxis in this age group?

Explanation

## Angiofibroma vs. Nasopharyngeal Carcinoma ### Epidemiology and Clinical Presentation **Key Point:** Nasopharyngeal angiofibroma (juvenile angiofibroma) is a benign, highly vascular tumor that occurs almost exclusively in adolescent and young adult males (peak 15–25 years), whereas nasopharyngeal carcinoma (predominantly squamous cell) occurs across all ages with a male predominance but is rare in children and young adults. ### Comparison Table | Feature | Angiofibroma | Nasopharyngeal Carcinoma | |---------|--------------|-------------------------| | **Age at presentation** | 15–25 years (adolescent males) | 40–60 years; rare <30 years | | **Sex predominance** | Almost exclusively male (95%) | Male > female (2–3:1) | | **Epistaxis** | Severe, recurrent, profuse | Present but usually mild-moderate | | **Nasal obstruction** | Marked, progressive | Present, often unilateral | | **Cervical lymphadenopathy** | Absent | Common (50–70% at diagnosis) | | **Constitutional symptoms** | Absent | Common (fever, weight loss, malaise) | | **Cranial nerve involvement** | Late (CN II, III, IV, V, VI if skull base extension) | Early (CN XII, IX, X common) | | **Histology** | Benign fibrous tissue + prominent vasculature, no keratinization | Squamous cell carcinoma with keratinization | | **Imaging (CT/MRI)** | Hypervascular, lobulated mass; widened sphenoid sinus | Infiltrative mass; bone erosion | | **Treatment** | Surgical excision ± hormone therapy | Chemoradiotherapy ± surgery | ### High-Yield Mnemonic **Mnemonic:** **YOUNG MALE BLEEDER** — Angiofibroma - **Y**oung (adolescent, <25 years) - **O**nly males (95%) - **U**ncontrolled epistaxis (severe, recurrent) - **N**asal obstruction (progressive) - **G**rowing mass (benign but locally aggressive) - **M**ale sex (almost exclusive) - **B**enign histology (no malignant features) - **L**ocal extension (skull base, not systemic) - **E**xclusion of lymph nodes (absent) - **E**xcision is curative - **D**iagnosis: imaging + biopsy - **E**pidemiologic rarity in females and older adults - **R**ecurrent bleeding (hallmark symptom) ### Clinical Pearl **Clinical Pearl:** The **combination of adolescent male, severe epistaxis, and nasal obstruction without constitutional symptoms or lymphadenopathy** is virtually diagnostic of angiofibroma. Nasopharyngeal carcinoma in a 28-year-old would be unusual; if present, it would include systemic symptoms and cervical nodes. ### Why the Correct Answer Stands Option 0 captures the most distinctive epidemiologic and clinical feature: angiofibroma is a disease of adolescent males with severe epistaxis, whereas nasopharyngeal carcinoma is rare in this age and sex group. This is the single best discriminator. [cite:Robbins 10e Ch 16; Harrison 21e Ch 209]