both pheochromocytomas and neuroblastomas can now be identified and located
with a high level of accuracy. Scintigraphy with MIBG has become an indisp
ensable diagnostic method for defining the extent and location of many if n
ot most pheochromocytomas, To define the stage, to document the course and
to evaluate the response to therapies in patients with neuroblastoma, imagi
ng with MIBG is now essential.