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COMPUTED TOMOGRAPHY FEATURES OF MIDDLE EAR CHOLESTEATOMA IN DOGS

Authors

  • OLGA TRAVETTI,

    1. Dipartimento di Scienze Cliniche Veterinarie, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy.
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  • CHIARA GIUDICE,

    1. Dipartimento di Patologia Animale, Igiene e Sanità Pubblica Veterinaria, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy.
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  • VALENTINA GRECI,

    1. Dipartimento di Scienze Cliniche Veterinarie, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy.
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  • ROCCO LOMBARDO,

    1. Dipartimento di Scienze Cliniche Veterinarie, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy.
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  • CARLO MARIA MORTELLARO,

    1. Dipartimento di Scienze Cliniche Veterinarie, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy.
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  • MAURO DI GIANCAMILLO

    1. Dipartimento di Scienze Cliniche Veterinarie, Faculty of Veterinary Medicine, Università degli Studi di Milano, Milano, Italy.
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  • A part of this work was presented at the 15th Annual Conference of the European Association of Veterinary Diagnostic Imaging. Chalkidiki—Thessaloniki—August 2007 (“Computed Tomography Pattern of Aural Cholesteatoma in 10 Dogs”).

Address correspondence and reprint requests to Olga Travetti, at the above address. E-mail: olga.travetti@unimi.it

Abstract

We describe the computed tomography (CT) findings in 11 dogs with middle ear cholesteatoma. The cholesteatoma appeared as an expansile tympanic cavity mass with a mean attenuation value of 55.8±4.2 Hounsfield units. There was no appreciable contrast enhancement of the tympanic bulla contense but ring enhancement was seen in four dogs. Due to the slow progressive growth, the lesion causes severe bone changes at the contour of the tympanic bulla, including osteolysis, osteoproliferation and osteosclerosis, expansion of the tympanic cavity, and sclerosis or osteoproliferation of the ipsilateral temporomandibular joint and paracondylar process. Cholesteatoma can cause lysis of the petrosal part of the temporal bone, leading to intracranial complications. Although not definitive, CT provides useful information for distinguishing a middle ear cholesteatoma from otitis media and neoplasia. In otitis media, enlargement of the tympanic cavity is not routinely observed. In tumors that primarily affect the middle or inner ear, the predominant signs are lysis of the contour of the tympanic bulla or the petrosal part of the temporal bone, soft tissue swelling around the middle ear and marked contrast enhancement. In tumors that arise from the external ear, a soft tissue mass is visible within the external acusticus meatus, and the middle ear is only involved secondarily.

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