## Angiographic Features of Nasopharyngeal Angiofibroma ### Characteristic Angiographic Findings **Key Point:** Nasopharyngeal angiofibroma shows an **intense tumor blush with early venous drainage and prominent arteriovenous shunting** on angiography. This is the hallmark vascular pattern. ### Detailed Angiographic Pattern | Feature | Characteristic | |---------|----------------| | **Arterial phase** | Intense, homogeneous blush (hypervascular) | | **Venous drainage** | Early/premature venous filling (AV shunting) | | **Feeding vessels** | Sphenopalatine artery (primary), maxillary artery branches | | **Tumor vascularity** | Extremely vascular; dense capillary network | | **Contrast pooling** | May show persistent blush in late arterial phase | ### Why This Pattern Occurs The tumor is composed of: - Abundant thin-walled vascular channels - Direct arteriovenous communications (shunts) - Minimal intervening fibrous stroma relative to vascularity - High metabolic demand This results in rapid transit of contrast from arterial to venous phase, creating the characteristic early venous drainage. **Clinical Pearl:** The intense blush and early venous drainage help differentiate NAF from other nasopharyngeal masses (lymphoma, carcinoma) which are typically hypovascular or show delayed enhancement. **High-Yield:** Angiography is performed preoperatively to: 1. Confirm diagnosis 2. Define feeding vessels for embolization 3. Assess extent of tumor 4. Plan surgical approach ### Embolization Implications The intense vascularity and AV shunting make preoperative embolization essential to reduce intraoperative bleeding. 
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