Biodistribution of ¹³¹I-cG250 in patient 4. (A) Anterior and (B) posterior whole body gamma camera image eight days after first infusion. Tumour uptake of ¹³¹I-cG250 (arrows) is seen in the right kidney (primary) and in the left scapula and L2 vertebra, as well as a previously undiagnosed right femur metastasis. (C) Single photon emission computed tomography (SPECT) 3D anterior coronal image of the abdomen and chest, showing uptake in tumour (arrows) in the right kidney, right upper rib and left scapula. (D) CT scan showing right kidney tumour (arrow). (E) Anteroposterior X-ray image of right femur showing lytic metastasis. (F) Whole body bone scan (posterior view) showing the previously undiagnosed right femur metastasis.