Improved detection of disseminated pheochromocytoma using post therapy I-131 MIBG scanning.

A 50-year-old man had metastatic pheochromocytoma to the left frontal bone. The primary adrenal tumor was removed 12 years previously. Bone scanning and diagnostic I-131 and I-123 MIBG imaging showed metastatic lesions in the right femur and midthoracic spine. However, post-therapy I-131 MIBG scanning showed extensive and widespread metastatic disease. Post-therapeutic I-131 MIBG whole-body scanning was necessary to more fully assess the extent of metastatic pheochromocytoma.