title: Differential diagnosis of ACTH-dependent hypercortisolism: imaging versus laboratory.
abstract: Differential diagnosis of ACTH-dependent Cushing's syndrome often presents major difficulties. Diagnostic troubles are increased by suboptimal specificity of endocrine tests, the rarity of ectopic ACTH secretion and the frequent incidental discovery of pituitary adenomas. A 43-year-old female reported with mild signs and symptoms of hypercortisolism, and initial hormonal tests and results of pituitary imaging (7-mm adenoma) were suggestive for Cushing's disease. However, inadequate response to corticotrophin-releasing hormone and failure to suppress after 8 mg dexamethasone pointed towards an ectopic source. Total body CT scan visualized only a small, non-specific nodule in the right posterior costophrenic excavation. Inferior petrosal sinus sampling revealed an absent center:periphery ACTH gradient but octreoscan and (18)F-FDG-PET-CT failed to detect abnormal tracer accumulation. We weighed results of the laboratory with those of imaging and decided to remove the lung nodule. Pathology identified a typical, ACTH-staining carcinoid and the diagnosis was confirmed by postsurgical hypoadrenalism. In conclusion, imaging may prove unsatisfactory or even misleading for the etiologial diagnosis of ACTH-dependent Cushing's syndrome and should therefore be interpreted only in context with results of hormonal dynamic testing.
authors.affiliation: Ospedale San Luca IRCCS, Istituto Auxologico Italiano, University of Milan, Via Spagnoletto 3, 20149, Milan, Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Andrioli
authors.forename: Francesca
authors.initials: F
authors.lastname: Pecori Giraldi
authors.forename: Martina
authors.initials: M
authors.lastname: De Martin
authors.forename: Agnese
authors.initials: A
authors.lastname: Cattaneo
authors.forename: Chiara
authors.initials: C
authors.lastname: Carzaniga
authors.forename: Francesco
authors.initials: F
authors.lastname: Cavagnini
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000378:metabolism*; D000328:Adult; D003480:Cushing Syndrome / Q000175:diagnosis* / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging
chemical_list: D000324:Adrenocorticotropic Hormone