Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

626 Small Animal Radiolo g y and Ultrasono graphy
Fig. 5-18 A 16-year-old male domestic short-haired cat with a
large mass involving the rostral part of the right mandible. A,
The lateral radiograph revealed a large tissue-dense mass that
contains spicules of tumor bone (white arrow). There is some
lysis of the mandibular cortex. B, The right lateral oblique radiograph
revealed more evidence of mandibular lysis. Differential
diagnoses include squamous cell carcinoma, primary bone
tumor, and infection. Diagnosis: Squamous cell carcinoma.
A
B
Fig. 5-19 A 10-year-old male Cockapoo had been salivating
excessively for 3 weeks. Oral examination revealed a mass
involving the left mandibular gingiva. The open-mouth ventrodorsal
view revealed a tissue-dense mass associated with the
left mandible at the level of the fourth premolar and first molar.
There were areas of calcification within the mass. No evidence
of bony destruction of the mandible was noted. Differential
diagnoses include epulis, squamous cell carcinoma, melanoma,
fibrosarcoma, and other soft-tissue tumor. Diagnosis: Epulis.
dental ligament, usually appears as a soft-tissue mass that may or may not contain dystrophic
calcification (Fig. 5-19). Odontoma, previously referred to as adamantinoma, a
tumor arising from tooth elements, usually is cystic and appears radiographically as multiloculated
radiolucent areas within the bone. Mineral densities or areas of bony proliferation
may be present within the expansile lesion (Fig. 5-20).