Pylorus
| Pyloric channel length |
< 17 mm |
| Muscle thickness |
< 3.0 mm |
Muscle
wall thickness: measured as a single hypoechoic layer between serosa
and echogenic submucosa. (muscle thickness exaggerated for illustration)
Note: PRETERM INFANTS. Borderline muscle thickness measurements
are more likely to occur in premature infants than in term infants.
In preterm infants, the thickness of the pyloric muscle relative to the
rest of the stomach and the pyloric canal length is more important than
the absolute muscle thickness.
References:
1.
Blumhagen JD, Maclin L, Krauter D, Rosenbaum DM, Weinberger E. Sonographic
diagnosis of hypertophic pyloric stenosis. AJR 1988; 150:1367-1370.
2.
Blumhagen JD, Weinberger E. Pediatric gastrointestinal ultrasounography.
In : Ultrasound annual. New York: Raven Press; 1986; 99-140.
3.
O'Keefe FN, Stansberry SD, Swischuk LE, Hayden CK Jr. Antropyloric
muscle thickness at US in infants: what is normal? Radiology 1991; 178:
827-830.
4.
Rollins MD, Shields MD, Quinn RJM, et al. Pyloric stenosis: congential
or acquired? Arch Dis Child 1989; 64:138-147.
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