Utility of [(18)F] fluoro-2-deoxy-D: -glucose positron emission tomography in the localization of ectopic ACTH-secreting tumors.
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.
Moraes
Aline Barbosa
AB
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.
Taboada
Giselle F
GF
Carneiro
Michel Pontes
MP
Neto
Leonardo Vieira
LV
Wildemberg
Luiz Eduardo Armondi
LE
Madi
Kalil
K
Domingues
Romeu Cortes
RC
Gadelha
Mônica R
MR
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*
D019788:Fluorodeoxyglucose F18