title: [Pneumosinus dilatans].
abstract: Pneumosinus dilatans is a localized abnormal dilatation of paranasal sinuses which contains only air and is covered with normal epithelium. We presented the X-ray, CT and MRI findings of three cases with pneumosinus dilatans secondary to arachnoid cyst and meningioma. When evaluating the patients with long-lasting symptoms, pneumosinus dilatans should be considered.
authors.affiliation: Hacettepe Universitesi, Radyoloji Anabilim Dali, Ankara, Turkey.
authors.forename: Erhan
authors.initials: E
authors.lastname: Akpinar
authors.forename: Mert
authors.initials: M
authors.lastname: Köroğlu
authors.forename: Tuncay
authors.initials: T
authors.lastname: Hazirolan
authors.forename: Murat
authors.initials: M
authors.lastname: Firat
mesh_terms: D000328:Adult; D016080:Arachnoid Cysts / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D002648:Child; D003937:Diagnosis, Differential; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D008579:Meningioma / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D008875:Middle Aged; D010254:Paranasal Sinus Diseases / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D014057:Tomography, X-Ray Computed