[Sonographic diagnosis of hypertrophic pyloric stenosis].

50 infants admitted during the years 1981 to 1985 for suspected hypertrophic pyloric stenosis were examined sonographically. A pyloric cockade of 14 mm or more in diameter is diagnostic. A diameter up to 10 mm can be considered normal, whereas values between 11 and 13 mm represent borderline cases, which need consideration of the clinical symptoms and repeated controls. Because of its accuracy sonography can replace X-ray examinations in most of the cases with suspected hypertrophic pyloric stenosis.