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Fig. 3 | Acta Veterinaria Scandinavica

Fig. 3

From: Bilateral tympanokeratomas (cholesteatomas) with bilateral otitis media, unilateral otitis interna and acoustic neuritis in a dog

Fig. 3

Subgross photomicrograph of the left ear. The tympanic membrane is not present resulting in direct communication between the external acoustic meatus (e) and tympanic cavity (t). A keratinizing squamous epithelial layer continuous with the external acoustic meatus (arrows) lines the middle ear compartment. Inset (square): A large aggregate of squamous epithelium (asterisk) is present within the cochlea (c) mixed with neutrophilic inflammation. This supports erosion of the petrous portion of the temporal bone and extension of the tympanokeratoma through this defect in the bone. Haematoxylin and eosin stain, bar: 5 mm

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