A 20-year-old man comes to the physician for a painful and erythematous left leg. He has had three episodes of superficial thrombophlebitis the past four years. Duplex venous ultrasonography confirms a deep vein thrombosis in the left leg. Which of the following is the most likely diagnosis?
Anticardiolipin antibodies
Antithrombin III deficiency
Hemophilia
Thrombasthenia
von Willebrand disease
