[Morphologic findings in hypertrophic pyloric stenosis (pyloric spasm)]

According to our morphological investigations (special clearance technique - light-polarized microscopy - systemically suitable histological sections) congenital hypertrophic pyloric stenosis is an impressive example for a closure mechanism by stretching: caused by constructive elongation the lumen of the primary narrow segment (canalis pyloricus) becomes nearly closed. On the contrary a disease related to pyloric dilatation is not known. Normal findings are compared to pathological observations and thereby the principle of the "Dehnverschluss" is explained by synoptically.