Whole-body and CT images of patient no. 2. (A) Serial anterior whole-body images of patient no. 2 showing increased accumulation of ¹³¹I-labeled 81C6 mAb in a large mediastinal lesion. (B) CT image showing the location of the lesion affecting the left lung. A biopsy sample was obtained from this node 17 hours after a dosimetric infusion of 370 MBq. The measured activity concentration was 37 kBq g-1. A supplemental video is available at the Blood website; see the Supplemental Video link at the top of the online article.