A case of inflammatory solitary internal iliac artery aneurysm successfully treated by an endovascular procedure.

An inflammatory aneurysm localized in the iliac artery is very rare. Aneurysms of the common iliac artery have been reported sporadically, but there has been no report of internal iliac artery aneurysm. The patient was a 64-year-old male presenting with left lower abdominal pain and fever. Abdominal computed tomography (CT) revealed an aneurysm of 42 × 52 mm in the left internal iliac artery. The aneurysmal wall had thickened and mantle sign was positive. Since the aneurysm was expected to adhere tightly to surrounding tissues, the risk of open surgery was judged to be high, and coil embolization of the aneurysm and the peripheral branches of the internal iliac artery was performed. Postoperatively, the left lower abdominal pain disappeared, and signs of inflammation were mitigated. The endovascular procedure was extremely effective for the treatment of this inflammatory iliac artery aneurysm.