Abstract
We report a case of abdominal aortic aneurysm invaded by periaortic malignant lymphoma. An 86-year-old woman who had had persistent abdominal pain for several days was urgently admitted to our hospital with suspected ruptured abdominal aortic aneurysm. An enhanced computed tomography scan showed an infrarenal aortic aneurysm with an area of soft tissue density in the retroperitoneal region, suggestive of hematoma. We performed emergency abdominal aortic reconstruction under a diagnosis of impending rupture of an abdominal aortic aneurysm. The intraoperative diagnosis was inflammatory abdominal aortic aneurysm, but the specimen from the abdominal wall revealed diffuse large B-cell lymphoma. She underwent chemotherapy, but died of multiple organ failure during the course of treatment.