Section Editor: Sandy Cheng-Yu Chen, M.D.
Taipei Medical University Hospital, Taipei, Taiwan
Figure Caption
Nasopharyngeal angiofibroma is a rare, benign, highly vascular, and locally aggressive tumor that occurs predominantly in male adolescents. The classic CT imaging findings include a hyperdense and strongly enhancing mass centered at sphenopalatine foramen (yellow arrow) and protruding to the nasal cavity. When the mass involves the pterygopalatine fossa, it leads to bowing of the posterior wall of the maxillary antrum (Holman Miller or antral sign; red arrows). Extension of the tumor through orbital fissures into the middle cranial fossa can also be seen (green arrow).