title: Pyloric volume: an important factor in the surgeon's ability to palpate the pyloric "olive" in hypertrophic pyloric stenosis.
abstract: OBJECTIVE
  The objective of this study was to determine whether the size of the pyloric mass is one of the factors in the surgeon's ability to palpate the pyloric "olive".
  
  
  METHODS
  The ultrasonographic images and medical records of 60 infants with surgically confirmed hypertrophic pyloric stenosis (HPS) were reviewed. The pyloric diameter (PD) and pyloric length (PL) were measured and the pyloric volume (PV) was calculated using the equation PV = 1/4pi x (PD)2 x PL. Based on the pediatric surgeon's physical examination the infants were divided into two groups: those with and those without palpable pyloric masses.
  
  
  RESULTS
  Infants with a palpable pyloric mass had an average pyloric volume of 3.33 +/- 1.76 mm3, which was statistically larger than those whose hypertrophied pylorus could not be palpated (average volume 2.59 +/- 2.07 mm3, P < 0.01). There was no statistically significant age difference between the two groups.
  
  
  CONCLUSIONS
  Clinical skill of the examiner and other clinical aspects (patient cooperation, etc.) determine palpability of the pylorus in HPS. The size of the hypertrophied pylorus is also an important factor affecting the clinician's ability to palpate the pyloric mass.
authors.affiliation: Department of Pediatric Radiology, Long Island Jewish Medical Center, The Long Island Campus of the Albert Einstein College of Medicine, Lakeville Road, New Hyde Park, NY 11040, USA.
authors.forename: R R
authors.initials: RR
authors.lastname: Ozsvath
authors.forename: M
authors.initials: M
authors.lastname: Poustchi-Amin
authors.forename: J C
authors.initials: JC
authors.lastname: Leonidas
authors.forename: S S
authors.initials: SS
authors.lastname: Elkowitz
mesh_terms: D000367:Age Factors; D002983:Clinical Competence; D003299:Cooperative Behavior; D005260:Female; D006801:Humans; D006984:Hypertrophy; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010173:Palpation; D010808:Physical Examination; D011707:Pyloric Stenosis / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D011708:Pylorus / Q000000981:diagnostic imaging / Q000473:pathology*; D012189:Retrospective Studies; D014463:Ultrasonography