Citation:Ballesta S, Chillarón JJ, Alameda F, Lafuente J, Carrera MJ. Cushing's disease due to pituitary oncocytoma: A case study and a review of the literature. Endocrinol Diabetes Nutr (Engl Ed). 2021;68(3):208-10. DOI: 10.1016/j.endinu.2020.03.003