Adrenal oncocytoma: an unusual etiology of Cushing's syndrome in an adolescent female.

Objectives: This report presents a rare pediatric functional AO causing CS and androgen excess. It aims to discuss the diagnostic challenges of cortisol and DHEAS co-secretion, which may mimic adenomas or carcinomas. It also emphasizes the role of clinical, biochemical, and imaging assessments, as well as histological classification using LWB criteria, and the need for long-term follow-up.

Case presentation: A 17-year-old female presented with weight gain, moon facies, cushingoid striae, oligomenorrhea, and acne over six months. Examination showed hypertension, grade I obesity, cushingoid stigmata without virilization. Endocrine evaluation was confirmed ACTH independent CS due to right AO.

Conclusions: This case illustrates functional AO as a rare cause of adolescent CS with androgen excess. Co-secretion patterns complicate diagnosis, imaging may not be definitive, and long-term follow-up is vital due to uncertain prognosis.