PAN-FU KAO2026-10-162026-10-161996-01-01Pure ID: 14916728Pure UUID: 286789df-0cc3-416a-9d04-17a798e76de810.1097/00003072-199612000-00026https://www.scopus.com/pages/publications/0029850259https://scholars.csmu.edu.tw/handle/123456789/29706A case of severe obstructive hydronephrosis, which caused a false- positive I-131 MIBG scan for detection of a pheochromocytoma is reported. A huge area of persistent I-131 MIBG accumulation 72 hours after injection in the left flank region was suspected to be a huge pheochromocytoma. Combined studies with I-131 MIBG, Tc-99m MDP, Tc-99m DMSA, and Tc-99m DTPA as well as furosemide injection disclosed that the abnormal I-131 MIBG accumulation was caused by left obstructive hydronephrosis. The result was finally confirmed by intravenous pyelography and CT studies.1enjournal article