+ Small<unk> wel dilation on CT scan in adults Diameter Assessment 4 cm Severely dilated A small<unk>  as seen on CT Average inner diameters and ranges of different sections of the large intestine. The main diagnostic tools are blood tests, X-rays of the abdomen, CT scanning, and ultrasound. If a mass is identified, biopsy may determine the nature of the mass. Radiological signs of<unk>  include<unk> wel distension and the presence of multiple (more than six) gas-fluid levels on supine and erect abdominal radiographs. Ultrasounds may be as useful as CT scanning to make the diagnosis. Contrast enema or small<unk> wel series or CT scan can be used to define the level of<unk> , whether the<unk>  is partial or complete, and to help define the cause of the<unk> . The appearance of water-soluble contrast in the cecum on an abdominal radiograph within 24 hours of it being given by mouth predicts resolution of an adhesive small<unk>  with sensitivity of 97% and specificity of 96%. Colonoscopy, small<unk> wel investigation with ingested camera or push endoscopy, and laparoscopy are other diagnostic options. File:UOTW 20 - Ultrasound of the Week 1.Small<unk>  on ultrasound File:UOTW 20 - Ultrasound of the Week 2.Small<unk>  on ultrasound File:UOTW 20 - Ultrasound of the Week 3.Small<unk>  on ultrasound Differential diagnosis Differential diagnoses of<unk>  include: * Ileus * Pseudo-obstruction or Ogilvie's syndrome * Intra-abdominal sepsis * Pneumonia or other systemic illness
Bowel obstruction
Intestinal pseudo-obstruction
Intestinal ischemia
Hereditary angioedema
Splenic infarction
Spontaneous bacterial peritonitis
Bowel infarction
Gallstone ileus