From the case: Juvenile nasopharyngeal angiofibroma
MRI of the paranasal sinuses
The mass is heterogeneously hyperintense on STIR. Prominent flow voids are noted in keeping with a highly vascular tumor. The mass extends through the right pterygopalatine fossa and laterally through the pterygomaxillary fissure into the masticator space. Mucosal thickening and fluid are noted in the right maxillary sinus.