Adrenal myelolipoma (AML) is a benign tumor that consists of mature adipose tissue and bone marrow elements. We report a case of a 57-year-old woman who presented with complaint of lower abdominal discomfort. Computed tomography scan of abdomen and pelvis revealed a mass in the left adrenal measuring 2.0 cm which was radiologically considered to be AML. Pathological evaluation of the lesion showed foci of lymphoid aggregate in a background of AML that were confirmed to be diffuse large B cell lymphoma by immunohistochemistry and gene rearrangement. To our knowledge, this collision tumor has not been reported previously. The clinical, radiological, pathological features, and treatment are discussed.

肾上腺骨髓脂肪瘤 (AML) 是一种良性肿瘤，由成熟的脂肪组织和骨髓成分组成。我们报告一例 57 岁女性，她主诉下腹部不适。腹部和骨盆的计算机断层扫描显示左侧肾上腺有一个 2.0 厘米的肿块，放射学上认为是 AML。病变的病理学评估显示在AML背景中的淋巴聚集灶，通过免疫组织化学和基因重排证实为弥漫性大B细胞淋巴瘤。据我们所知，这种碰撞肿瘤以前没有报道过。讨论了临床、放射学、病理特征和治疗。