Page 35 - Atlas of Small Animal CT and MRI

Nasal Cavity and Paranasal Sinuses 25

Figure 1.1.26 Nasal Mast Cell Tumor (Canine) CT & MR

(a) T1, DP (b) T1+C, DP (c) T1, SP

(d) CT, TP (e) T2, TP
8y FS Labrador Retriever with a rostral nasal mass. A well‐defined ovoid mass is located adjacent to the right nares (a–c). The mass is
soft‐tissue attenuating on the CT image (d) and moderately T1 hyperintense (b) and markedly T2 hyperintense (e) on MR images. The T2
hyperintensity extends beyond the mass margins, indicating the presence of perilesional edema. The mass is only mildly contrast
enhancing, which slightly diminishes lesion conspicuity because of the degree of enhancement of adjacent normal tissues (b). Biopsy
revealed grade II–III mast cell tumor.

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