What is the difference between pyloric stenosis and hypertrophic pyloric stenosis?

Same entity: Some use the optional discriptor "hypertrophic" as an add on to pyloric stenosis. Ps is by caused by an overgrowth and tightening of the muscles surrounding the pyloric region of the small intestine. As such the "hypertrophic" is a redundant term. Some do a similar thing by saying yellow jaundicde when jaundice would be sufficient.

Similar: Hypertrophic pyloric stenosis is seen in newborns from enlargement of the muscle at the distal part of the stomach before it goes into the small intestine. Pyloric stenosis by itself can be any narrowing of the distal part of the stomach and occur in several different age groups. Both of these usually require surgical correction.

Usually same: In infants pyloric stenosis is abbreviation for hypertrophic pyloric stenosis (HPS). Refers to thickening or hypertrophy of pyloric muscle at outlet of stomach.