title: Hypoechoic renal pyramids: sonographic visualization in older children and young adults.
abstract: The frequency and degree of visualization of medullary pyramids in a normal population, aged 10-29 years, was analyzed. Hypoechoic pyramids were visualized in 42% of right kidneys in subjects aged 10-18 years and in 27% of subjects aged 19-29 years. Prominently hypoechoic pyramids, mimicking the appearance of neonatal kidneys, were seen in an additional 34% of subjects aged 10-18 years and in 16% aged 19-29 years. Prominent pyramids were present in 50% of subjects with renal cortical echogenicity (RCE) equal to liver, but also in 21% of subjects with RCE less than liver. Our study expands the age at which prominently hypoechoic medullary pyramids can be considered a normal finding. This may relate to recent improvements in ultrasound technology.
authors.affiliation: Department of Diagnostic Radiology, Cleveland Clinic Foundation, OH 44195.
authors.forename: D M
authors.initials: DM
authors.lastname: Einstein
authors.forename: A A
authors.initials: AA
authors.lastname: Singer
authors.forename: D M
authors.initials: DM
authors.lastname: Paushter
authors.forename: A
authors.initials: A
authors.lastname: Nasif
authors.forename: J V
authors.initials: JV
authors.lastname: Nally
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D006801:Humans; D007679:Kidney Medulla / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D008099:Liver / Q000000981:diagnostic imaging; D012016:Reference Values; D012189:Retrospective Studies; D014463:Ultrasonography