FRI241 Late Diagnosis Of Non-classical CAH In An Elderly Male Previously Diagnosed With Estrogen Producing Adrenal Tumor

Disclosure: R. Kaval: None. J. Subauste: None. In 2013 a 66-year-old Caucasian male presented to the VA outpatient endocrinology clinic to establish care; the patient carried a diagnosis of estrogen producing left adrenal tumor in 1989 at the age of 42 at an outside facility. On review of records the patient was initially worked up for hypogonadism and was noted to have an elevated estrogen level and a “left adrenal tumor”. He subsequently underwent an unilateral left adrenalectomy for treatment and pathology reported with benign tumor findings. Following surgery, the patient was started on steroid and mineralocorticoid replacement for primary adrenal insufficiency (PAI) and topical testosterone gel for hypogonadism. The question was raised as to why this patient had PAI as he had an intact right adrenal gland on CT scan. On laboratory work-up in 2006 the patient had baseline cortisol of 3.4 ug/dl, ACTH was elevated at 99 pg/ml [7.2- 63.3], and adrenal antibodies (21-OH antibody] were negative. Renin was 2.35 ng/ml/hr [0.167-5.380], Estradiol was 41.8 pg/ml [7.6 - 42.6], LH was low at 0.20 mIU/ml [1.2-8.6] and total testosterone was low at 2.2 ng/ml [1.8-7.8]. Repeat testing yielded ACTH that was elevated at 686.7 pg/ml [7.2- 63.3], electrolytes including sodium and potassium were normal. On physical examination the patient had hyperpigmented skin, normal height, weight and otherwise unremarkable. On CT scan of the abdomen the right adrenal gland was mildly diffusely enlarged. In 2019, 30 years after his initial diagnosis the team questioned whether the adrenal tumor was truly an estrogen producing tumor. As a result, 17-OH progesterone was obtained, and the unstimulated value resulted as 3522 ng/dl [27-199]. With the elevated 17 OH >1000 ng/dL this was diagnostic for Non-classical CAH. The unilateral adrenalectomy likely unmasked the underlying impairment of cortisol production leading to primary AI that is seen with Non-classical CAH patients. The patient was lost to follow up during the pandemic, hence we were not able to perform and further testing. Presentation: Friday, June 16, 2023