8059 An Interesting Case Of Hypogonadism Likely Caused By Cushing's Syndrome

Abstract Disclosure: R. Ripa: None. J. Su: None. R. Patel: None. Introduction: Cushing’s Syndrome is a rare endocrine disorder that comprises a multitude of symptoms caused by hypercortisolism. Given non-specific symptoms, the disease can often be overlooked for more common diseases, such as diabetes, obesity, and even hypogonadism. Hypogonadism is a clinical disorder defined by decreased functional activity of the gonads. The diagnosis can often be challenging in developed males, who present with hypogonadotropic hypogonadism without an obvious cause. Here we present a case of a male who presented with hypogonadism symptoms for at least 5 years before being diagnosed with Cushing’s syndrome. Case Presentation: 58-year-old Caucasian male with a medical history of hypertension, cardiomyopathy and a BMI of 23, presented with decreased libido and erectile dysfunction. He was started on testosterone therapy three years prior, however it was discontinued due to heart failure. Without testosterone replacement, lab work was notable for: low free and total testosterone, 21.4 and 50.6 ng/dL, respectively, inappropriately normal findings of LH, FSH (1.0 and 4.9 IU/L, respectively), as well as unremarkable findings of GH, Prolactin, TSH, pituitary MRI and testes ultrasound, leading to a suspicion of hypogonadism. Due to persistent symptoms of hypogonadism and low testosterone, clomiphene was started but later changed to testosterone therapy after cardiology consultation. Shortly after, he began reporting facial flushing, associated with facial roundedness and elevated blood pressure. Upon further work up, hyperaldosteronism and pheochromocytoma testing was negative and his baseline cortisol was 21.9 mcg/dL with a low adrenocorticotropic hormone (ACTH), 5 pg/mL. Further, dexamethasone suppression testing showed suboptimally suppressed cortisol (14.4 mcg/dL). An abdomen MRI with and without contrast revealed a 2.3 cm adrenal adenoma, confirming an adrenal source of Cushing’s syndrome, and he underwent an adrenalectomy. Post-procedure, his cortisol and ACTH levels normalized to 10.5 mcg/dL and 39 pg/mL, respectively, showing a revival of his hypothalamic - pituitary - adrenal axis. Unfortunately, however, his free and total testosterone levels continued to remain low (38.9 and 152 ng/dL, respectively) and he was continued on testosterone therapy. Discussion: Our patient initially presented with decreased libido, and low testosterone levels and was treated for hypogonadism, as he did not have typical Cushing’s symptoms. Due to eventual weight gain and facial edema, it was only then that work up was pursued showing hypercortisolism release, leading to a proper diagnosis of Cushing’s syndrome. Hypercortisolism can affect all parts of the body, including hormones, muscles, joints and bones. When presenting in the initial stages and with mild symptoms, the diagnosis of hypercortisolism is often challenging and can go undetected for many years. Presentation: 6/2/2024