Ultrasonography and computed tomography of afferent loop obstruction.

The US and CT findings in a case of afferent loop obstruction after total gastrectomy are reported. A U-shaped fluid filled tubular structure crossing the midline between the abdominal aorta and the superior mesenteric artery (SMA) is a characteristic US and CT image of an afferent loop obstruction. CT is helpful to recognize the bowel wall and to demonstrate its relationship with the biliary system. Its vague clinical picture and confusing laboratory findings may mimic pseudocysts.