Screening for testicular adrenal rest tumors among children with congenital adrenal hyperplasia at King Fahad Medical City, Saudi Arabia.

Objectives: To assess the incidence of testicular adrenal rest tumors (TARTs) among male children with congenital adrenal hyperplasia (CAH) in tertiary care centers.

Methods: All male children aged 1-14 years diagnosed with CAH due to 21-hydroxylase deficiency (21 HOD), 11β-hydroxylase deficiency, and 3β-hydroxysteroid dehydrogenase deficiency, confirmed by biochemical and/or genetic testing, underwent scrotal ultrasound examination to identify TARTs. After receiving the diagnosed patients' data, patients' electronic medical records were accessed to collect demographic data and scrotal ultrasound results, along with growth parameters and specific biochemical test results within 2 months of the ultrasound.

Results: TARTs were observed in 5 (10.9%) of 46 male children with CAH. Four patients with positive findings had 21 HOD classical CAH with salt loss and one had 21 HOD simple virilizing classical CAH. All patients had poor compliance and stage 2 bilateral TARTs. Three TART-positive patients (60.0%) had high ACTH levels, 5 patients (100%) had elevated 17-OHP levels, and 5 patients (100%) had advanced bone age. The youngest patient with positive findings was 4 years old.

Conclusions: The prevalence of TARTs increases with age and can be present in young males with classical CAH with 21 HOD. It is associated with elevated 17-hydroxyprogesterone (17-OHP) and advanced bone age SDS. TARTs are less likely to be associated with nonclassical CAH with 21 HOD or other less common CAHs due to 11β-hydroxylase deficiencies and 3β-hydroxysteroid dehydrogenase deficiencies in children. Our study recommends early and routine screening of TARTs in children with CAH.