## Origin of Nasopharyngeal Angiofibroma ### Anatomical Site Nasopharyngeal angiofibroma (NAF) arises from the **lateral wall of the nasopharynx near the fossa of Rosenmüller**, specifically from the area around the sphenopalatine foramen and the pterygopalatine fossa. This location is critical because the tumor derives its blood supply from branches of the maxillary artery (sphenopalatine artery). **Key Point:** The tumor originates from the roof of the pterygoid fossa, not the roof of the nasopharynx itself, though it may extend superiorly into the sphenoid sinus. ### Clinical Significance The lateral wall origin explains: - Unilateral presentation (almost always) - Early involvement of the sphenopalatine foramen - Progressive extension into the pterygopalatine and infratemporal fossae - Potential for intracranial extension via the foramen lacerum **High-Yield:** The fossa of Rosenmüller (lateral pharyngeal recess) is the classic site of origin — this is a frequently tested anatomical detail in NEET PG. ### Embryological Basis The tumor is thought to arise from remnants of the first branchial arch mesenchyme, specifically from vascular and fibrous tissue in the pterygoid region. 
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