A rare case of adrenal collision tumor: Myelolipoma and schwannoma in the adrenal gland

Abstract

Adrenal collision tumors refer to coexistence of two adjacent, but histologically distinct, neoplasms involving the adrenal gland without histologic admixture at the interface. Myelolipoma is a rare but benign neoplasm. As its name implies, displays both mature adipose tissue and hematopoietic elements. These are usually unilateral and asymptomatic. Schwannomas, tumors derived from the peripheral nerve sheath, are also uncommon lesions in the adrenal gland. Here, we present a rare case of a 65-year-old male with clinical history of abdominal aortic aneurysm who was found to have a 13-cm “incidentaloma” by interventional radiologist during his aortic endograft control. Giving the size of the mass, team decided to excise it, and histopathological examination was performed. While most incidentally discovered adrenal tumors are benign, surgical excision is recommended in large lesions to exclude malignancy, avoid hemorrhage, and/or acute adrenal insufficiency. Given the rarity of such entity, its clinical course and prognosis remains unclear.