Ultrasound of the upper abdomen
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Diffuse hypertrophic enlargement of the muscular wall of the pylorus measuring 23 mm in length. It measured 15 mm in width. It measured 7 mm in maximum pyloric muscle thickness during crying.
During crying, the length mildly decreased but the width and muscle thickness mildly increases (thickness increased from 6 mm to 7 mm). This may be due to contraction of pylorus during crying).