PS-R03-10: CASE REPORT: CUSHING SYNDROME IN A YOUNG MALE

Abstract

A 27-year-old male without any significant past medical history was advised to visit a hospital for elevated blood pressure, elevated liver enzymes, and dyslipidemia in a workplace health checkup. His body weight had increased by more than 10 kg in the last two years. He presented to our department and underwent laboratory work-up. He had bilateral lower limb pitting edema, hypokalemia, and elevation of low-density lipoprotein. No sign of dysthyroidism, renin-angiotensin-aldosterone system disorder, or increased catecholamine secretion was found. Diet and exercise therapy and calcium channel blocker did not improve his hypertension, and he suffered from lumber vertebral fracture, refractory hypokalemia, and lower leg cellulitis. He was admitted to our department for detailed examination of worsening lower limb edema. On admission, he had striae on his abdomen and legs as well as edema of both lower extremities. The endocrinological data showed high levels of adrenocorticotropic hormone (ACTH) and cortisol. Overnight 1 mg dexamethasone suppression test resulted in a non-suppression response, and his circadian rhythm of cortisol was absent. Urine cortisol level was high. These findings confirmed the diagnosis of ACTH-dependent Cushing syndrome. A contrasted magnetic resonance imaging (MRI) scan demonstrated enlargement of the pituitary gland more than 1 cm in length. Taking into account drug-resistant hypokalemia and vulnerability to infection, he was administered with metyrapone 500 mg per day until he underwent transsphenoidal hypophysectomy. The pathological findings were consistent with that of a pituitary adenoma. Postoperative MRI scan showed remnant lesions which stretch to the bilateral cavernous sinuses and the right middle cranial fossa. Although a decrease in urine cortisol was observed, the absence of a circadian rhythm of cortisol, hypertension, and hypokalemia persisted. He is now treated with somatostatin analog and craniotomy followed by gamma knife surgery is planned. Cushing syndrome should be suspected in cases of early-onset hypertension with symptoms including weight gain, hypokalemia, and bone fracture.