The authors report two cases of vascular colitis in Korean with a review of literature. Case I, 20 years old male had severe abdominal pain and bloody diarrhea. Case II was 57 years old male and complained severe abdominal pain. Barium enema colon study on each cases disclosed typical thumbprinting appearance of involved segment. Follow-up study after conservative treatment of 5 to 10 days showed satisfactory improvement. Predisposing factor in case I appeared to be anaphylactoid purpura, and in case IIdistal obstruction due to adenocacinoma. the Mechanism of vascular colitis was briefly discussed.