We report on an acromegalic patient who developed a true aneurysm in the right femoral artery. Plain computed tomography (CT) showed a sort tissue mass with low density adjacent to the right femoral artery. T1-weighted magnetic resonance (MR) images exhibited the lesion with moderate hypointensity peripherally, and hypointensity centrally. T2-weighted images showed the lesion to have areas of hypointensity, moderate hyperintensity, and marked hyperintensity. Surgery revealed an ectasia or the common femoral artery and a true aneurysm from the lateral femoral circumflex artery. (C) 2001 Elsevier Science Inc. All rights reserved.