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Ultrasound of a baby's belly shows abnormal thickening of the wall at the exit of the stomach, which is also called pylorus. The wall thickening blocks content of the stomach from moving on into the small bowel and therefore can cause vomiting (diagnosis of hypertrophic pyloric stenosis).

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.