## Investigation of Choice for Nasopharyngeal Angiofibroma ### Why MRI with Gadolinium is Gold Standard **Key Point:** MRI with gadolinium contrast is the gold standard imaging modality for diagnosis and preoperative assessment of nasopharyngeal angiofibroma (NAF). **High-Yield:** MRI provides: - Excellent soft tissue contrast without radiation - Clear delineation of tumor margins and extent - Assessment of intracranial extension - Evaluation of cavernous sinus involvement - Superior visualization of vascular flow voids (characteristic of angiofibroma) ### Characteristic MRI Findings | Feature | MRI Appearance | |---------|----------------| | T1-weighted | Isointense to hypointense | | T2-weighted | Hyperintense with flow voids | | Gadolinium enhancement | Heterogeneous, intense enhancement | | Flow voids | Multiple serpentine voids (pathognomonic) | **Clinical Pearl:** The presence of multiple flow voids on MRI is virtually pathognomonic for angiofibroma and reflects the highly vascular nature of the tumor. ### Role of Other Investigations **CT:** Useful for assessing bony erosion and pterygoid plate involvement, but inferior to MRI for soft tissue characterization. Often used as adjunct to MRI. **Nasal Endoscopy with Biopsy:** CONTRAINDICATED. Biopsy risks severe hemorrhage due to the hypervascular nature of the tumor. Diagnosis should be made on imaging alone. **Digital Subtraction Angiography:** Invasive procedure reserved for preoperative embolization planning, not diagnosis. **Key Point:** Never biopsy a suspected angiofibroma — the risk of life-threatening hemorrhage outweighs diagnostic benefit when imaging is diagnostic. 
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