Slo-mo aural explosion
A 4 year-old male Poodle was presented for tenderness of the left ear and pain when opening the mouth, as well as a left-sided head tilt.
Image 1 + 2: Expansile lysis of left tympanic bulla with ring-like enhancement.
Image 3: Lysis of petrosal part of temporal bone, involving inner ear.
Image 4: Adjacent focal meningeal enhancement.
- Left tympanokeratoma (aural cholesteatoma) with secondary reactive meningitis.
- Cholesteatomas more appropriately named tympanokeratoma due to origin from tympanic membrane.
- Progressive hyperkeratosis creates the expansile character.
- CT allows for characterization of ear disease and differentiation from otitis media or neoplasia.
- Pathogenesis still controversial, but usually associated with chronic otitis media and expand with growth.
- Secondary infection can create a life-threatening situation with otitis interna and involvement of central nervous system.
- »Bilateral tympanokeratomas (cholesteatomas) with bilateral otisis media, unilateral otitis interna and acoustic neuritis in a dog«
— Østevik et al., Acta Vet Scand. 2018 May; 60: 31
- »Computed Tomography features of middle ear cholesteatoma in dog«
— Travetti et al, Vet Radiol & Ultrasound 51(4) 2010; 374-379
- »Aural cholesteatoma in 20 dogs«
— Hardie et al., Vet Surg. 2008; 37(8); 763-70
Images courtesy of the AniCura Tierklinik Haar, Germany.
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