The authors retrospectively an허ysed the uJtrasonographic findings of 43 cases of surgically confirmed hypertrophic pyloric stenosis and their postoperative findings of sonograms taken at 1 month(n = 40) or 3 months(n = 5) after pyloromyotomy In preoperative study, the thickened pyloric muscle was isoechoic or slight hypoechoic relative to liver on the midline longitudinal view and appeared as a " nonuniform acoustic ring" on the transverse view. The results of measurement in the all cases with hypertrophic pyloric stenosis were the pyloric muscle thickness 르 3.8mm, the pyloric diameter 늘 14mm, the pyloric channel length 르 16mm, the pyloric muscle volume 늘 2.21Cm 3 and the pyloric muscle index 늘 0.57, respectively.It usually reguired 1 month after operation for the hypertrophied muscle to resolve in 36 of 40 patientsThe normalized pyloric muscle appered more hypoechoic than that of adjacent hepatic parenchyma, and the nonuniform echogenicity of the pyloric muscle disappeared. Five patients whose hypertrophied musle did not return to normal range on 1 month's follw -up sonogram were fì이 lwed-up 3 months later again, and we have ascertained their resoluction in all of them In concusion, the pre-operative sonographic findings of infantile hypertrophic pyloric stensis were different quantitatively and qualitatively from those of post-operative f,이 low-up ultrasound exam. High-resolution real time sonography is a safe and accurate method for the diagnsis of hypertrophic pyloric stenosis and useful in postpyloromyotomy follow-up '
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