Anatomical location of the 20 localized tumors confirmed to be causing tumor-induced osteomalacia. Black X’s represent tumors located in soft tissues (10/20, 50%); white X’s represent tumors located in bone (10/20, 50%). Star-like structures represents metastases. Four tumors occurred in the head and neck, 14 occurred in the extremities, and 2 occurred in the torso. Two subjects had metastases, both of which occurred in the lungs. One originated in the left forearm and the other arose from the right mandible. Fourteen of the 20 tumors were found on the left side of the body, 5 were found on the right side, and one was midline.