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A 34-year-old man was diagnosed with clinical Cushing's syndrome based on circadian fluctuation of plasma adrenocorticotropin and serum cortisol levels and Liddle's-method. The presence of ectopic adrenocorticotropin production was suspected. Urine 5-hydroxyindoleaceturic acid level was high. Chest computed-tomography scan revealed a mass in the right upper lung. 111In-pentetrotide scintigraphy demonstrated marked accumulation in the right upper lung. We suspected an adrenocorticotropin-producing bronchial carcinoid. Plasma adrenocorticotropin and serum cortisol levels decreased immediately following resection of the tumor. Adrenocorticotropin production by tumor cells was confirmed by immunohistochemistry. This case indicates 111In-pentetrotide scintigraphy could be successfully used to identify and localize ectopic adrenocorticotropin-producing bronchial carcinoid.

internal medicine

Successful Use of 111In-Pentetrotide Scintigraphy for Localizing Ectopic Adrenocorticotropin-Producing Bronchial Carcinoid Tumor in a Patient with Cushing's Syndrome