Page 680 - Atlas of Small Animal CT and MRI

670 Atlas of Small Animal CT and MRI

Figure 6.4.7 Synovial Cell Sarcoma (Canine) CT & MR

(a) CT, TP (b) CT, TP (c) CT, TP

(d) CT+C, TP (e) CT+C, TP (f) CT+C, TP

(g) T1, DP (h) T1, SP (i) T2, SP
12y FS Labrador Retriever with swelling of the right stifle. Images a–c and d–f are unenhanced and comparable contrast‐enhanced
transverse CT images, respectively, acquired at the level of the right stifle and ordered from proximal to distal. A lobular mass, which is
hypoattenuating compared to adjacent muscle, surrounds the distal femur and encroaches on the femoropatellar joint (a–c: arrowheads).
There is a multicameral, peripheral pattern of enhancement following intravenous contrast administration (d–f). The mass is heterogene-
ously T1 and T2 hyperintense to adjacent muscle (g–i: arrowheads), and MR images clearly show the tumor has an intra‐articular
component (h,i: arrow). Postmortem examination confirmed a diagnosis of low‐grade synovial cell sarcoma.

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