title: Iodine-131 MIBG imaging in multiple endocrine neoplasia type 2B.
abstract: A 16-year-old boy had a swollen neck that was a result of multiple endocrine neoplasia Type 2B (MEN 2B). CT revealed bilateral thyroid tumors, swelling of right cervical lymph nodes, and slight enlargement of the right adrenal gland. I-131 metaiodobenzylguanidine (MIBG) scintigraphy demonstrated increased uptake in the right adrenal gland and the left thyroid tumor, but no abnormal uptake in the right thyroid tumor and the right cervical lymph nodes. Postoperative pathologic findings were consistent with the diagnosis of right adrenal medullary hyperplasia, which is a precursor of pheochromocytoma. In patients with MEN 2B, I-131 MIBG scintigraphy in conjunction with CT of the adrenal glands should be performed to determine the disease stage of the adrenal medullae. In the cervical region, the diagnosis was medullary thyroid carcinoma (MTC) in both thyroid tumors and metastases in the right cervical lymph nodes. The right MTC was more aggressive than the left MTC. It is interesting that not all sites of known MTC take up I-131 MIBG to the same degree.
authors.affiliation: Department of Radiology, Kagawa Medical University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yamamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Isobe
authors.forename: Y
authors.initials: Y
authors.lastname: Nishiyama
authors.forename: H
authors.initials: H
authors.lastname: Takashima
authors.forename: M
authors.initials: M
authors.lastname: Ohkawa
authors.forename: M
authors.initials: M
authors.lastname: Kihara
authors.forename: K
authors.initials: K
authors.lastname: Matsusaka
authors.forename: A
authors.initials: A
authors.lastname: Miyauchi
authors.forename: S
authors.initials: S
authors.lastname: Kobayashi
authors.forename: M
authors.initials: M
authors.lastname: Tanabe
mesh_terms: D019797:3-Iodobenzylguanidine; D000293:Adolescent; D000310:Adrenal Gland Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology; D000313:Adrenal Medulla / Q000000981:diagnostic imaging / Q000473:pathology; D000315:Adrenalectomy; D018276:Carcinoma, Medullary / Q000000981:diagnostic imaging / Q000556:secondary; D006801:Humans; D006965:Hyperplasia; D007457:Iodine Radioisotopes; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging; D008297:Male; D018814:Multiple Endocrine Neoplasia Type 2b / Q000000981:diagnostic imaging*; D009367:Neoplasm Staging; D010673:Pheochromocytoma / Q000473:pathology; D011230:Precancerous Conditions / Q000473:pathology; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging; D013965:Thyroidectomy; D014057:Tomography, X-Ray Computed
chemical_list: D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals; D019797:3-Iodobenzylguanidine