May-Thurner syndrome presenting as pelvic congestion syndrome and vulvar varicosities in a nonpregnant adolescent.

May-Thurner syndrome (MTS) refers to compression of the left common iliac vein (CIV) by the common iliac artery. Although this is typically manifested as acute left lower extremity deep venous thrombosis, MTS is a rare cause of pelvic congestion syndrome. A 17-year-old girl presented with a 5-year history of worsening painful vulvar and labial varicosities. Venography demonstrated pelvic collateralization and left CIV stenosis consistent with MTS. The left CIV was stented with complete radiographic resolution. At 1-year follow-up, the patient is asymptomatic with a widely patent stent. This case highlights the role of endovascular therapy for patients presenting with MTS causing pelvic congestion syndrome.