title: Composition of urinary tract calculi in children of different ages.
abstract: The composition of urinary tract calculi in children in relation to their age has been examined and comparisons have been made with other published series. It is concluded that paediatric stone disease can be divided into two main types: (1) infection stones, composed largely of magnesium ammonium phosphate and occurring mainly in children under 5 years of age, (2) calcium stones, occurring mainly in older children.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002118:Calcium / Q000032:analysis; D002648:Child; D003553:Cystine / Q000032:analysis; D005260:Female; D006801:Humans; D008274:Magnesium / Q000032:analysis; D008297:Male; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D014545:Urinary Calculi / Q000378:metabolism*
chemical_list: D000644:Quaternary Ammonium Compounds; D003553:Cystine; D008274:Magnesium; D002118:Calcium