Infectious colitis<unk> 
Ulcerative colitis
CMV colitis
Crohn's colitis
Toxic colitis (antineoplastic agents)
Pseudomembranous colitis
Fibrosing colonopathy (Cystic fibrosis)
Abdominal aortic aneurysm
Aortocaval fistula
Acute gastroenteritis
Aortoenteric fisulta
Appendicitis (early)
Bowel obstruction
Large bowel obstruction
Ogilvie's syndrome
Small bowel obstruction
Malignant bowel obstruction
Bowel perforation
Gastroparesis
Diabetic ketoacidosis
Hernia
Inflammatory bowel disease
Mesenteric<unk> 
Mesenteric vein thrombosis
Pancreatitis
Peritonitis
Sickle cell crisis
Spontaneous bacterial peritonitis
Volvulus
Aortocaval fistula
Large bowel obstruction
Ogilvie's syndrome
Small bowel obstruction
Malignant bowel obstruction
Ogilvie's syndrome
Mesenteric vein thrombosis
Ischemic colitis
Infectious colitis
Ulcerative colitis
Stercoral colitis
Diverticulitis
CMV colitis
Crohn's colitis
Diverticulosis