Abstract
A 72-year-old woman who had been admitted to hospital with a nontuberculous mycobacterial infection was incidentally found to have an 18-mm splenic artery aneurysm at the hilus of the spleen with no evidence of rupture on abdominal computed tomography. The following year, the splenic artery aneurysm had grown to 19 mm in diameter, and it was concluded that observation could be continued. However, two years after observation began, she was admitted to hospital with purulent spondylitis, and the aneurysm had grown to 47 mm in diameter. Thus, the spleen was resected. The resected specimen showed a splenic artery aneurysm at the hilus of the spleen with severe atherosclerosis. A case of a giant splenic artery aneurysm that expanded rapidly during observation is described.
