Fig. 1From: Bilateral tympanokeratomas (cholesteatomas) with bilateral otitis media, unilateral otitis interna and acoustic neuritis in a dogKeratin debris in the left middle ear. Transection of the left ear shows grey, soft material in the external ear canal (e) and pearly white keratin (asterisk) in the tympanic bulla (t). To the left of the image is the cranial vault (cv). The tympanic bulla is formed by the petrous portion of the temporal bone (arrowheads)Back to article page