Iodine I 131 Metaiodobenzylguanidine in Treating Patients With Recurrent, Progressive, or Refractory Neuroblastoma or Malignant Pheochromocytoma or Paraganglioma

"Patients receive a single dose of iodine I 131 metaiodobenzylguanidine (\^131I-MIBG) IV over 30 minutes to 4 hours or for 15 minutes for smaller patients on day 0. Patients undergo radiation dosimetry following the first dose of \^131I-MIBG to determine if a second dose can be safely administered. Some patients may receive a second dose of iodine I 131 metaiodobenzylguanidine (\^131I-MIBG) 6-8 weeks after the first dose if response is achieved and patients do not experience major toxicity. After blood radioactivity has fallen below 1 μCi/mL, patients may undergo autologous stem cell transplantation.~After completion of study treatment, patients are followed at 4-6 weeks after \^131I-MIBG administration and then every 3 months for up to 1 year. Once patients are off treatment on this protocol, they will begin long term follow up through 5 years from enrollment."