title: Juvenile nasopharyngeal angiofibroma: an ultrastructural study.
mesh_terms: D000293:Adolescent; D002467:Cell Nucleus / Q000648:ultrastructure; D002648:Child; D003593:Cytoplasm / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D018219:Histiocytoma, Benign Fibrous / Q000648:ultrastructure*; D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000648:ultrastructure*; D009364:Neoplasm Recurrence, Local