title: High-resolution CT of mastoid sinus pneumocele with external auditory canal stenosis.
abstract: A 34-year-old man presented with tinnitus and conductive hearing loss. CT demonstrated an expansile, air-containing cavity contiguous with mastoid air cells, narrowing the external auditory canal. This is a case of symptomatic pneumocele resulting in an air collection beneath external canal lining, possibly related to an abnormality in mastoid fusion.
authors.affiliation: Department of Radiology, Methodist Hospital, Merrillville, Ind., USA.
authors.forename: R
authors.initials: R
authors.lastname: Lichtenberg
authors.forename: E J
authors.initials: EJ
authors.lastname: Russell
mesh_terms: D000328:Adult; D000388:Air; D003251:Constriction, Pathologic; D004424:Ear Canal / Q000002:abnormalities / Q000000981:diagnostic imaging*; D006314:Hearing Loss, Conductive / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008416:Mastoid / Q000002:abnormalities / Q000000981:diagnostic imaging*; D011859:Radiography; D013701:Temporal Bone / Q000002:abnormalities / Q000000981:diagnostic imaging; D014012:Tinnitus / Q000000981:diagnostic imaging