Kirks, D R Transverse folds in the proximal ureter: a normal variant in infants. [electronic resource] - AJR. American journal of roentgenology Mar 1978 - 463-4 p. digital Publication Type: Journal Article ISSN: 0361-803X Standard No.: 10.2214/ajr.130.3.463 doi Subjects--Topical Terms: HumansInfantInfant, NewbornRadiographyUreter--anatomy & histology