title: Utility of [(18)F] fluoro-2-deoxy-D: -glucose positron emission tomography in the localization of ectopic ACTH-secreting tumors.
abstract: Ectopically ACTH producing tumors may be difficult to localize by conventional radiology and functional imaging may be helpful. Case 1: 31-year-old man was diagnosed with ectopic ACTH-dependent Cushing's syndrome (ECS). Thorax CT revealed a 1.3 cm nodular opacity in upper left lobe, suggestive of residual lesion. [(18)F] fluoro-2-deoxy-D: -glucose ([(18)F] FDG) positron emission tomography ([(18)F] FDG PET) scan revealed mild glycolytic metabolic activity. Pathological examination confirmed an ACTH-positive carcinoid tumor. Case 2: 53-year-old woman presented with very rapid onset ECS. Pituitary MRI was normal. Thorax CT revealed no tumoral lesion. Abdominal and pelvic MRI showed images suggestive of hepatic and iliac, femoral and lumbar secondary implants. [(18)F] FDG PET scan revealed intense uptake in uterus, especially cervix, suggesting this to be the primary tumor site. These cases illustrate the role of [(18)F] FDG PET in the investigation of an ECS where conventional imaging studies were not elucidative in the search for a responsible tumor.
authors.affiliation: Endocrinology Unit, Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro (UFRJ), Rua Nascimento Silva, 555 apt: 101, CEP: 22421-020, Rio de Janeiro, RJ, Brazil.
authors.forename: Aline Barbosa
authors.initials: AB
authors.lastname: Moraes
authors.forename: Giselle F
authors.initials: GF
authors.lastname: Taboada
authors.forename: Michel Pontes
authors.initials: MP
authors.lastname: Carneiro
authors.forename: Leonardo Vieira
authors.initials: LV
authors.lastname: Neto
authors.forename: Luiz Eduardo Armondi
authors.initials: LE
authors.lastname: Wildemberg
authors.forename: Kalil
authors.initials: K
authors.lastname: Madi
authors.forename: Romeu Cortes
authors.initials: RC
authors.lastname: Domingues
authors.forename: Mônica R
authors.initials: MR
authors.lastname: Gadelha
mesh_terms: D000328:Adult; D002276:Carcinoid Tumor / Q000175:diagnosis / Q000378:metabolism; D018288:Carcinoma, Small Cell / Q000175:diagnosis / Q000378:metabolism; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000175:diagnosis* / Q000378:metabolism*; D049268:Positron-Emission Tomography / Q000379:methods*
chemical_list: D019788:Fluorodeoxyglucose F18