Page 676 - Atlas of Small Animal CT and MRI

666 Atlas of Small Animal CT and MRI

Figure 6.4.3 Osteosarcoma (Canine) CT
10y M Belgian Tervuren with left thoracic limb
lameness of 2 months’ duration. There is an
expansile mixed productive and osteolytic mass
arising from the ulnar diaphysis (a). Image b is
a magnification of image a centered on the
ulna proximal to the primary lesion. There is
a subtle increase in medullary attenuation
(b: arrow) near the bone lesion as compared to
the normal low attenuation seen more proxi-
mally (b: arrowhead). This region markedly and
homogeneously enhances following contrast
administration, indicative of proximal tumor
extension (c: arrow). Fine‐needle aspiration
biopsy yielded a diagnosis of osteosarcoma.
(b) CT, SP

(a) CT, SP (c) CT+C, SP

666