Page 48 - Atlas of Small Animal CT and MRI

Figure 1.2.17 Squamous Cell Carcinoma (Canine) MR

(a) T1, TP (b) T2, TP (c) T1+C, TP

(d) T1+C, SP (e) T1+C, DP (f) T1+C, DP
7y MC Labrador Retriever with a 1‐month history of head tilt. There is a large, irregularly margined, and highly invasive mass of
mixed‐signal intensity arising from the region of the right middle ear (a,b). An amorphous signal void seen centrally within the mass on
multiple sequences suggests partial mineralization. The right tympanic bulla is absent, and incomplete destruction of the petrosal and
squamous parts of the right temporal bone is evident. The mass extends intracranially (a,b,c,f: arrow) and incorporates the right
temporomandibular joint (d,e). Biopsy revealed squamous cell carcinoma.

Figure 1.2.18 Cartilage Mineralization (Canine) CT

(a) CT, TP (b) CT, TP
6y M German Shepherd Dog with longstanding history of bilateral otitis externa. Pronounced mineralization of the horizontal and vertical
external ear canal walls is evident (a,b). External ear canals are occluded because of stenosis and exudates (a,b). Fluid‐attenuating
material is also present within the left tympanic bulla, indicative of concurrent otitis media (a). Biopsy of the canal wall revealed chronic
neutrophilic otitis externa with osseous metaplasia.

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