| Summary: | More than 700 adventitial cystic diseases (ACDs) have been reported in the literature, with most cases affecting the popliteal artery in young men. Here, we describe our treatment and etiologic consideration of a patient who presented with an ACD of the external iliac artery, known to be an extremely rare location. On preoperative imaging, the ACD had a connection to the nearby hip joint and was treated with resection of the affected segment, including ligation of the joint connection and interposition with a prosthetic graft. The pathogenesis of ACDs is not fully understood; however, we believe that joint connections are important in their development and treatment.
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