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Cholesterol Granuloma Associated with Otitis Media and Destruction of the Tympanic Bulla in a Dog

The Department of the Veterinary Clinic and Hospital, University of Melbourne, Werribee, Victoria, Australia

Abstract

An 8-year-old, male neutered Irish Setter was presented with a 2-week history of pain upon opening the mouth and chronic otitis externa. Computed tomography examination revealed destruction of the left tympanic bulla with a soft-tissue density within the remains of the tympanic cavity. Cytology of aspirates collected from tissue adjacent to the tympanic bulla revealed suppurative inflammation and bacteria. A ventral bulla osteotomy was performed. Histopathology of granulation tissue within the remains of the tympanic cavity was diagnostic of cholesterol granuloma.

Key words: Cholesterol granuloma; computed tomography; dogs; histopathology; middle ear; otitis media.

Request reprints from Dr. R. A. Fliegner, University of Melbourne, Department of the Veterinary Clinic and Hospital, 250 Princes Highway, Werribee, Victoria 3030 (Australia). E-mail: rflie{at}unimelb.edu.au