Pneumosinus dilatans of the sphenoid sinus.
D000328:Adult; D000368:Aged; D003937:Diagnosis, Differential; D004108:Dilatation, Pathologic / Q000175:diagnosis; D006801:Humans; D008297:Male; D010038:Otorhinolaryngologic Diseases / Q000175:diagnosis / Q000601:surgery; D013101:Sphenoid Sinus