This article describes the MRI features of a middle ear cholesteatoma in an 8 yr old flat-coated retriever. Physical examination revealed pain on opening the jaw, and otoscopic examination showed tympanic membrane rupture associated with hyperplastic tissue at the entrance of the middle ear. Standard MRI sequences allowed for the identification of a severely expanded bulla containing material that was isointense to brain tissue on T1-weighted images and of mixed intensity on T2-weighted and fluid-attenuated inversion recovery sequences. No postcontrast enhancement of the content was present, but the lining of the bulla was partially enhanced. The images allowed evaluation of the surgical margins and the secondary changes due to the expansion of the mass. Surgery was performed and histopathology confirmed the presumptive diagnosis of cholesteatoma. In the present case, MRI appeared to serve as a good alternative to computed tomography for the diagnosis of cholesteatoma.
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September/October 2012
Case Reports|
September 01 2012
MRI Findings of a Middle Ear Cholesteatoma in a Dog
Nathaniel X. Harran, DMV;
Diagnostic Imaging Department (N.X.H., K.J.B., F.B.), Internal Medicine Department (N.H.), Surgery Department (K.L.B.), and Division of Veterinary Pathology (M.D.), School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
Correspondence: [email protected] (N.X.H.)
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Kate J. Bradley, MA, VetMB, PhD, DVR, DECVDI;
Kate J. Bradley, MA, VetMB, PhD, DVR, DECVDI
Diagnostic Imaging Department (N.X.H., K.J.B., F.B.), Internal Medicine Department (N.H.), Surgery Department (K.L.B.), and Division of Veterinary Pathology (M.D.), School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
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Natasha Hetzel, BSc, BVSc;
Natasha Hetzel, BSc, BVSc
Diagnostic Imaging Department (N.X.H., K.J.B., F.B.), Internal Medicine Department (N.H.), Surgery Department (K.L.B.), and Division of Veterinary Pathology (M.D.), School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
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Kelly L. Bowlt, BVMS;
Kelly L. Bowlt, BVMS
Diagnostic Imaging Department (N.X.H., K.J.B., F.B.), Internal Medicine Department (N.H.), Surgery Department (K.L.B.), and Division of Veterinary Pathology (M.D.), School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
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Michael J. Day, BSc, BVMS(Hons), PhD, DSc, DECVP, FASM, FRCPath;
Michael J. Day, BSc, BVMS(Hons), PhD, DSc, DECVP, FASM, FRCPath
Diagnostic Imaging Department (N.X.H., K.J.B., F.B.), Internal Medicine Department (N.H.), Surgery Department (K.L.B.), and Division of Veterinary Pathology (M.D.), School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
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Frances Barr, MA, VetMB, PhD, DVR, DECVDI
Frances Barr, MA, VetMB, PhD, DVR, DECVDI
Diagnostic Imaging Department (N.X.H., K.J.B., F.B.), Internal Medicine Department (N.H.), Surgery Department (K.L.B.), and Division of Veterinary Pathology (M.D.), School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom.
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J Am Anim Hosp Assoc (2012) 48 (5): 339–343.
Citation
Nathaniel X. Harran, Kate J. Bradley, Natasha Hetzel, Kelly L. Bowlt, Michael J. Day, Frances Barr; MRI Findings of a Middle Ear Cholesteatoma in a Dog. J Am Anim Hosp Assoc 1 September 2012; 48 (5): 339–343. doi: https://doi.org/10.5326/JAAHA-MS-5777
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