Extracranial carotid aneurysm due to Behçet disease is extremely rare. To our knowledge, this complication has been previously reported in only 12 cases. We report two new cases of extracranial carotid aneurysm in Behçet disease and discuss the clinical features, therapeutic modalities, and postoperative complications of these uncommon lesions.

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Extracorporeal shock wave lithotripsy (ESWL) can lead to rare but severe arterial complications. The causal relationship of ESWL with arterial pseudoaneurysm formation in a patient with Behçet disease is discussed. A 35-yearold man presented with acute recrudescence of right flank pain caused by ureteral lithiasis immediately after having undergone a last session of ESWL. Abdominal examination revealed a painful pulsatile mass in the right iliac region. Contrast-enhanced computed tomography identified a pseudoaneurysm of the right external iliac artery in a patient with a medical history of Behçet disease. The pseudoaneurysm was treated endovascularly, including the use of a covered stent with intensive immunosuppressive therapy. We obtained successful exclusion of the pseudoaneurysm. This case highlights that arterial pseudoaneurysm may occur after ESWL in patients with Behçet disease. Strict follow-up after ESWL sessions is necessary.