Behcet's syndrome (BS) is a chronic disease characterized by the presence oral and genital ulcers, skin, eye, gastrointestinal, vascular, and central nervous system involvement; the etiology of the disease is not fully understood. While it is known to be frequent in Mediterranean countries, the highest prevalence is in Turkey. In BS, various types of vascular involvement are identifiable. BS generally leads to venous thrombosis with more frequent involvement at lower extremities, and majority of cases are men. While thrombophlebitis is often observed, thromboembolic diseases are rarely found, because the venous thrombi adhere to the walls of the veins tightly.