Radiopaedia.org

Again noted is a large mass extending from the right posterior nasopharynx into the sphenoid sinus. It expands the pterygopalatine fossa on the right filling the right retroantral fat pad, extends laterally through the pterygomaxillary fissure into the subjacent masticator space. The mass is isointense on T1, heterogeneously hyperintense on STIR, containing some internal flow voids, and demonstrates marked contrast enhancement on the postcontrast imaging. There is opacification of the right maxillary sinus with bloody or proteinaceous fluid. Remainder of the paranasal sinuses and mastoid air cells are clear.