title: Intraparenchymal pneumocephalus caused by ethmoid sinus osteoma.
abstract: We report a 57-year-old man with intraparenchymal pneumocephalus caused by ethmoid sinus osteoma. He had a history of severe allergic rhinitis, which caused him to frequently blow his nose, and he was referred to our hospital with headache and mild left hemiparesis. CT scans revealed a large volume of intraparenchymal air entrapped in the right frontal lobe related to an osteoma in the ethmoid sinus. The osteoma eroded the upper wall of the sinus and extended into the anterior cranial fossa. At operation, we observed that the osteoma had protruded intracranially through the skull base, disrupted the dura and extended into the frontal lobe. To our knowledge, this is the first report of a patient with intraparenchymal pneumocephalus caused by an ethmoid sinus osteoma.
authors.affiliation: Department of Neurosurgery, Division of Neuroscience, Graduate School of Medical Science, Kanazawa University, 13-1 Takaramachi, Kanazawa, Ishikawa 920 8641, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Kamide
authors.forename: Mitsutoshi
authors.initials: M
authors.lastname: Nakada
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Hayashi
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Uchiyama
authors.forename: Jun-Ichiro
authors.initials: J
authors.lastname: Hamada
mesh_terms: D001859:Bone Neoplasms / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D005005:Ethmoid Sinus / Q000000981:diagnostic imaging / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010016:Osteoma / Q000150:complications* / Q000000981:diagnostic imaging / Q000473:pathology; D011007:Pneumocephalus / Q000000981:diagnostic imaging / Q000209:etiology*; D014057:Tomography, X-Ray Computed / Q000379:methods