Gamma camera biodistribution images of ¹³¹I-cG250. (A) Whole body anterior image showing uptake of ¹³¹I-cG250 in hepatic metastases (arrows), also evident on CT scan. Some bowel excretion of ¹³¹I is also evident. (B) Whole body anterior image showing uptake showing uptake of ¹³¹I-cG250 in a lung metastasis (arrow), seen also on chest radiograph.