Nickan Research Institute Journal of Renal Endocrinology 2423-6438 4 1 2018 01 01 Bronchopulmonary carcinoid tumor presenting as dexamethasone suppressible Cushing’s syndrome; a case report e14 e14 EN Rezvan Salehidoost Sara Sadrzadeh Mohammadreza Khosravifarsani Journal Article 2018 03 07 2018 05 04 Cushing’s syndrome is an endocrine condition with complex diagnostic pathways. Cortisol suppression from high-dose dexamethasone suppression tests usually points to the pituitary as the cause. We present a patient with high-dose dexamethasone suppressible Cushing’s syndrome from a bronchopulmonary carcinoid tumor. A 30-year-old male presented with signs and symptoms of Cushing’s syndrome. Cortisol and ACTH levels were significantly elevated. High-dose dexamethasone test suppressed cortisol production. However, no pituitary source was found. In chest-computed tomography a well-differentiated mass was seen, octreotide scan localized somatostatin-positive tumor in the same place, which revealed a bronchopulmonary carcinoid tumor. Bronchopulmonary carcinoid tumor should be kept in the mind in the differential diagnosis of Cushing’s syndrome with suppression of the high-dose dexamethasone test if a pituitary source is not localized.