The association of an adrenal myelolipoma with a non-functioning adenoma is very rare. Herein, we report on such a case in an asymptomatic 64-year-old woman. To the best of our knowledge, there is only one other case of non-functioning adrenocortical adenoma associated with myelolipoma in the same gland. Furthermore, only two other adenomas (mineral corticoids and corticosteroid producing tumors) associated with myelolipomas have been reported, and both myelolipomas were less than 1 cm in size. In conclusion, the 8.5 cm myelolipoma in our case is the largest compared with the three previously reported ones.