MRI IN THOROTRASTOSIS

Magnetic resonance imaging (MRI) and computed tomography (CT) were per formed in four patients with thorotrastosis. On CT scan, Thorotrast (t horium oxide) deposition was shown as high-density areas in the liver and spleen and the abdominal lymph nodes. These deposits were not foun d on MRIs. Splenic volume was significantly small due to atrophy. The contrast-noise ratio in the spleen on T1-weighted images was significa ntly lower. Thorotrast deposition does not affect MRI appearance; ther efore it may be useful for the early detection of malignant tumors as a complication of thorotrastosis.