Inferior petrosal sinus venous sampling in cushing’s syndrome: potential diagnostic pitfall

Evaluation of cause of hypercortisolism among patients with Cushing’s syndrome may be challenge for the clinicians (1). The identification between pituitary and ectopic ACTH Production is one of the most complex diagnoses in endocrine practice. Here we reported a rare case of Cushing disease which was diagnosed by Inferior petrosal sinus sampling (IPSS) method. We report this case to highlight how IPSS helped to resolve the source of ACTH production.