Pelvic venous congestion syndrome: feminine venous congestive syndromes and endovascular therapy solutions Ultimately, compression from the right prevalent iliac artery around the remaining common iliac vein from the spine and pelvic brim is understood to cause iliofemoral deep venous thrombosis (May well–Thurner syndrome) together with the pelvic varices of PCS. https://www.sgvascularctr.com/service/pelvic-congestion-syndrome/