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Background: Clinical manifestations of Nonclassic CAH (NCCAH) in women may range from asymptomatic to hirsutism, oligo-menorrhea, or infertility. Testicular adrenal rest tumors are common in men with classic CAH though uncommon in NCCAH. In women with classic CAH, ovarian adrenal rest tumors are even rarer. 11–58% of patients with classic CAH will have at least one adrenal nodule but the prevalence is unknown in NCCAH (1). Clinical Case: A 34-year-old Hispanic woman was seen by reproductive endocrinology for evaluation of infertility. She had been unable to conceive for the past 7 years. She was diagnosed with PCOS by her PCP. She was referred to our clinic for further workup. The patient denied galactorrhea. Laboratory evaluation revealed prolactin 49.3 (< 20.0 ng/ml), TSH 2.290 (0.5–5.0 μU/mL), fT4 1.14 (0.9–2.3 ng/dL), total testosterone 92 (15 -70 ng/dL for women), DHEAS 361 (45 -270 µg/dL), 8 AM cortisol 20.0 (5–23 μg/dL), ACTH 59.0 (6–76 pg/ml), 17-hydroxyprogesterone (17OHP) >2000 ng/dL, and A1c 5%. 24-hour urinary free cortisol was 26.4 (3.5–45 mcg/day). MRI of the pituitary did not show any adenoma. Pelvic ultrasound did not reveal any ovarian cysts. Cosyntropin stimulation test showed baseline 17OHP 1076 ng/dL, 30 minutes 8812 ng/dL, and 60 minutes 9452 ng/dL. She was begun on hydrocortisone and cabergoline. CT of the abdomen did not reveal any adrenal masses but showed mildly thickened adrenal limbs suggesting adrenal hyperplasia. A 4.5 cm exophytic enhancing mass on the left kidney was noted representing an adrenal rest tumor versus angiomyolipoma. Given the exophytic nature of the mass and increased risk of hemorrhage with angiomyolipomas greater than 4 cm, the patient was referred to urology and interventional radiology for radioembolization and possible biopsy of the mass. We are unsure if this renal mass is an angiomyolipoma or an adrenal rest tumor, which are uncommon in the kidneys. The patient was also referred for genetic counseling. Patients with CAH typically have CYP21A2 gene mutations, and the chance that a patient with NCCAH will have a child with classic CAH is reported to be 1 to 2% in two large cohort studies (2). Conclusion: This case is a reminder that evaluation of infertility/subfertility includes less common diagnoses, such as NCCAH. This genetic disorder is seen more frequently in certain ethnic groups, including Hispanics; and after diagnosis, patients should be referred to a genetic specialist. Additional abdominopelvic imaging should be considered in both men and women with a new diagnosis of NCCAH to evaluate for rare but clinically significant tumors. Reference: 1. Nordenström, A., Falhammar H. Diagnosis and management of the patient with non-classic CAH due to 21-hydroxylase deficiency Eur J Endocrinol. 2019 Mar;180(3):R127-R145.2. Merke, D, Auchus, R Congenital Adrenal Hyperplasia Due to 21-Hydroxylase Deficiency. NEJM 2020;383:1248–61.

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