Aortoiliac thrombus secondary to a mineralized arteriosclerotic lesion

A 12-year-old, neutered female, Siberian Husky dog presented with a hind li mb weakness of one month duration. To facilitate making a diagnosis multipl e imaging modalities were performed. These modalities included radiography, ultrasonography, magnetic resonance imaging (MRI), magnetic resonance angi ography (MRA) and selective angiography of the abdominal aorta. In this dog , the MRI/MRA studies provided the first documentation of the external ilia c thrombi and the collateral circulation via the lumbar arteries. At necrop sy, an aortoiliac thrombus caused by a mineralized arteriosclerotic plaque mas noted.