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Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

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Chapter Five The Skull 625<br />

Fig. 5-16 A 13-year-old male Siamese cat with a swelling<br />

about the base of the right ear. The ventrodorsal view<br />

revealed obliteration of the ear canal by a tissue-dense mass<br />

as well as destruction of the right temporal <strong>and</strong> parietal<br />

bones. Differential diagnoses include primary bone tumor,<br />

squamous cell carcinoma of the ear canal, mucinous gl<strong>and</strong><br />

adenocarcinoma of the ear canal, <strong>and</strong> metastatic neoplasia.<br />

Diagnosis: Mucinous gl<strong>and</strong> adenocarcinoma.<br />

Fig. 5-17 An 8-year-old male Collie with a swelling involving<br />

the left side of the face. The slightly oblique ventrodorsal<br />

view revealed destruction of the cortex of the maxilla<br />

<strong>and</strong> production of new bone within the associated softtissue<br />

mass. The periosteum has been elevated from its normal<br />

location, <strong>and</strong> a Codman’s triangle is seen (white arrow).<br />

Differential diagnoses include primary neoplasia (e.g.,<br />

osteosarcoma, chondrosarcoma, squamous cell carcinoma),<br />

metastatic neoplasia, <strong>and</strong> infection. Diagnosis: Squamous<br />

cell carcinoma.

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