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Journal Article
Review
The difficulties of pseudo-Cushing's syndrome (or "non-neoplastic hypercortisolism").
Annales D'endocrinologie 2018 June
Pseudo-Cushing's syndrome covers different pathological conditions responsible for mild-to-moderate ACTH-dependent hypercortisolism, related not to an ACTH-secreting tumor but rather to CRH and/or AVP hypothalamic secretion through activation of various neural pathways, in patients generally displaying excess central adiposity. It is better termed "non-neoplastic hypercortisolism" (NNH). The main conditions implicated in NNH comprise: neuropsychiatric disorder, alcohol abuse, insulin-resistant obesity, polycystic ovary syndrome, and end-stage kidney disease. Glucocorticoid resistance is one differential diagnosis, as are some cases of primary adrenal disease with incompletely suppressed ACTH. Differentiating between NNH and mild-to-moderate Cushing's disease can be a real challenge. Clinical analysis, based on thorough history taking and screening for catabolic signs is essential; useful explorations include midnight serum or salivary cortisol and Dex/CRH and ddAVP stimulation response. Pituitary MRI suffers from limitations regarding both sensitivity and specificity, while bilateral inferior petrosal sinus sampling cannot distinguish between pituitary ACTH secretion by a tumor or by normal cells stimulated by endogenous CRH. Definitive diagnosis of functional etiology requires demonstrating that treatment of the underlying condition restores normal secretion of ACTH and cortisol, but this is not always possible. Lingering diagnostic uncertainty has to be accepted in certain patients, who will have to be followed up for some time before diagnosis can be considered more or less definitive.
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