title: Technetium-99m methoxyisobutylisonitrile localizes an ectopic ACTH-producing tumour: case report and review of the literature.
abstract: Extensive investigation including whole-body examinations with computed tomography and magnetic resonance imaging did not detect the suspected ectopic ACTH-producing tumour in a patient with advanced Cushing's syndrome and hypokalemic alkalosis. Gamma camera examination with technetium-99m methoxyisobutylisonitrile (MIBI) depicted the tumour, which was localized in the anterior neck and mediastinum. This was later verified by surgery. 99mTc-MIBI is normally used for myocardial scintigraphy. Its accumulation is unspecific and merely reflects metabolic activity. Despite this, the present case shows that examination with this agent can provide important information with regard to tumour localization in a given situation, thereby serving as a complement to other imaging modalities. The current literature on 99mTc-MIBI for tumour diagnosis is reviewed.
authors.affiliation: Department of Diagnostic Radiology, Karolinska Hospital, Stockholm, Sweden.
authors.forename: H
authors.initials: H
authors.lastname: Jacobsson
authors.forename: G
authors.initials: G
authors.lastname: Wallin
authors.forename: S
authors.initials: S
authors.lastname: Werner
authors.forename: S A
authors.initials: SA
authors.lastname: Larsson
mesh_terms: D000182:ACTH Syndrome, Ectopic / Q000000981:diagnostic imaging*; D000328:Adult; D002276:Carcinoid Tumor / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000556:secondary; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D009333:Neck; D011877:Radionuclide Imaging; D017256:Technetium Tc 99m Sestamibi; D013953:Thymus Neoplasms / Q000000981:diagnostic imaging / Q000378:metabolism*
chemical_list: D017256:Technetium Tc 99m Sestamibi