Abstract
We report a rare case of localized aortic dissection superimposed on an infrarenal abdominal aortic aneurysm (AAA). The patient was a 79-year-old woman who had been given a diagnosis of infrarenal AAA at another hospital, and thereafter the maximum aneurysm diameter had remained at 36 mm for 2 years. However, the patient subsequently suffered sudden abdominal and back pain, and computed tomography demonstrated a localized infrarenal aortic dissection superimposed on the AAA. The entry point was located within the AAA. The false lumen extended to the aorta around the renal artery, and the false lumen of the proximal aorta was thrombosed. The maximum diameter of the AAA was 40 mm, but 5 months after the onset of dissection, the aneurysm enlarged to 55 mm, and the patient presented to our hospital. Vascular reconstruction was performed via a bifurcated graft. The thrombosed false lumen of the proximal aorta had disappeared in the previous 5 months, which enabled the clamping of the neck of the aneurysm, and we secured it by suturing in the usual manner.
