| Summary: | A 36-year-old man was admitted for a tender inflammatory type IV thoracoabdominal aortic aneurysm with multiple aortic dilations. After open repair, he remained frail, but results of all infectious and inflammatory investigations were negative. Hypermetabolic intrasplenic collections were discovered on postoperative computed tomography, and aortitis with aseptic abscess syndrome was strongly suggested. Immunosuppressive therapy was undertaken, and his health improved dramatically. After 7 years of treatment, however, the initial aortic dilations had developed in size, necessitating multiple surgical procedures leading to complete aortic replacement. The postoperative course was uneventful with a satisfactory final computed tomography scan. Subsequent to immunotherapy, no new aneurysm developed.
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