title: Spontaneous extracranial pneumatocele associated with mastoid hyperpneumatization.
abstract: Spontaneous extracranial pneumatoceles unassociated with trauma are rare. We report a case of spontaneous extracranial mastoid pneumatocele associated with exuberant pneumatization of the calvarium and mastoid. The patient presented with a compressible bulge over the base of the zygoma and superior to the pinna. Surgical exploration demonstrated a large air sac in continuity with nontraumatic bony defects of the tympanosquamous and tympanomastoid sutures.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Manhattan Eye, Ear and Throat Hospital, New York, New York.
authors.forename: M J
authors.initials: MJ
authors.lastname: Levenson
authors.forename: G
authors.initials: G
authors.lastname: Ahuja
authors.forename: T
authors.initials: T
authors.lastname: Bergeron
mesh_terms: D000388:Air; D006801:Humans; D008297:Male; D008416:Mastoid / Q000000981:diagnostic imaging*; D008875:Middle Aged; D014057:Tomography, X-Ray Computed