[Motor deficit complicating an isolated aneurysm of the internal iliac artery].

A 70-year-old man was admitted to the orthopaedic ward for severe sciatic pain and motor deficit. Diagnosis of a unique aneurysm of the right medial iliac artery and compression of the neighbouring elements was based on CT scan, echography and angiography imaging. This observation emphasizes the importance of a through physical examination. Unique aneurysm of the medial iliac artery is rarely observed. Effective treatment and satisfactory results can be obtained with simple ligature.