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 ischemia
Mesenteric vein thrombosis
Pancreatitis
Peritonitis
Sickle cell crisis<unk> 
Volvulus
Aortocaval fistula
Large bowel obstruction
Ogilvie's syndrome
Small bowel obstruction
Malignant bowel obstruction
Ogilvie's syndrome
Mesenteric vein thrombosis
Obesity
Intestinal obstruction
Pregnancy
Ascites
Cirrhosis
Malignancy
Heart failure
Tuberculosis<unk> 
Peritoneal dialysis-associated peritonitis
Distended bladder / Acute urinary retention
Constipation / fecal impaction
Large tumor(s) (e.g. ovarian, lymphoma)
Organomegaly
Cirrhosis
Malignancy
Heart failure
Tuberculosis
Spontaneous bacterial peritonitis
Abdominal aortic aneurysm
Peritoneal dialysis-associated peritonitis
Aortocaval fistula
Large bowel obstruction
Acute gastroenteritis
Malignant bowel obstruction
Aortoenteric fisulta