Page 512 - Atlas of Small Animal CT and MRI

502 Atlas of Small Animal CT and MRI

Figure 5.1.18 Cystic Sublumbar Carcinoma (Canine) CT
7y MC Golden Retriever cross with a history of
straining to defecate. Images a and c are com­
parable unenhanced and contrast­enhanced
images, and b is cranial to c. There is a large,
central mass that is uniformly hypoattenuating
on unenhanced images (a). There is rim
enhancement of the mass following intrave­
nous contrast administration (c: arrows), and
the sublumbar vasculature deviates laterally as
a result of the mass effect (b: arrowheads).
Excisional biopsy confirmed regional meta­
(a) CT, TP (b) CT+C, TP
static carcinoma of probable anal gland origin.
The normal left medial iliac lymph node is seen
lateral to the vasculature (b: open arrow). The
sagittal image shows the extent of the mass
and colonic compression in the pelvic inlet (d).

(c) CT+C, TP (d) CT+C, SP

Figure 5.1.19 Metastatic Mast Cell Tumor (Canine) CT

(a) CT, TP (b) CT+C, TP (c) CT+C, TP
7y MC Labrador Retriever with mast cell tumor on the right pelvic limb. Images a and b are comparable unenhanced and contrast­
enhanced images, and c is a magnification of b. On a CT scan acquired for radiation therapy planning, the right medial iliac lymph node
is enlarged and irregular, displacing the local vasculature ventrally. On the contrast‐enhanced image, there is mild peripheral enhance­
ment (b: arrows) and no enhancement centrally. Metastatic mast cell tumor was confirmed by fine‐needle aspiration cytology.

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