en Surgery Surgery case report case report <p><span style="font-family: times new roman;"><span style="color: rgb(0, 0, 255);"><strong><em>Background: </em></strong></span>Arteriovenous malformations are one of the most common vascular disorders of the colon. Vascular disorders present as painless, high-volume rectal bleeding.</span></p> <p><span style="font-family: times new roman;"><span style="color: rgb(0, 0, 255);"><strong><em>Case Presentation:</em></strong></span> This study elucidates two rare cases of vascular disorders that are diagnosed as angiodysplasia of the left colon and cavernous hemangioma of the colon and rectum.&nbsp; The chief complaint in two patients was rectorrhagia. The patients who were diagnosed of ulcerative colitis were treated with sulfadiazine and prednisone. Due to continuous bleeding, the patients were referred to the surgery department for operation. The patients underwent total proctocolectomy.</span></p> <p><span style="font-family: times new roman;"><span style="color: rgb(0, 0, 255);"><strong><em>Conclusion: </em></strong></span>We discuss the faults in the diagnosis and management of vascular disorders of the intestine<span dir="RTL">.</span></span></p> Gastrointestinal Hemorrhage, Rectorrhagia, Arteriovenous malformation, Angiodisplasia 52 55 http://caspjim.com/browse.php?a_code=A-10-128-2&slc_lang=en&sid=1 Ghodratollah Maddah maddahgh@mums.ac.ir 10031947532846007457 10031947532846007457 No Endoscopic and Minimally Invasive Surgery Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Abbas Abdollahi abdollahia@mums.ac.ir 10031947532846007458 10031947532846007458 Yes Surgical Oncology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Omid Rouhbakhshfar rouhbakhsho881@mums.ac.ir 10031947532846007459 10031947532846007459 No Student Research Committee, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran Shirin Taraz Jamshidi tjamshidish@mums.ac.ir 10031947532846007460 10031947532846007460 No Cancer Research Center, Mashhad University of Medical Sciences, Mashhad, Iran Masoumeh Hassanpour hassanpourm1@mums.ac.ir 10031947532846007461 10031947532846007461 No Surgical Oncology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran