\s=b\The characteristics of 31 adolescent patients aged 11 to 20 years with urolithiasis were examined by means of a ten-year retrospective chart review. The majority of stones were found to be secondary to preexisting conditions, with the most common being bladder dysfunction (neurogenic or exstrophy). Exogenous corticosteroid therapy appeared to play a role in lithogenesis in five patients and was the only apparent contributing factor in an 11\m=1/2\-year-old girl. Childhood inborn errors of metabolism accounted for the stones in four of the teenagers. An additional four adolescents did not have any definable biochemical, genetic, or anatomic abnormalities and, therefore, no obvious etiology.(Am J Dis Child 132: [1117][1118][1119][1120] 1978) In the spectrum of disorders that affect the urinary tract of adoles¬ cents and young adults, stones are uncommon but not altogether rare.Recently challenged by this clinical problem, we found little in the litera¬ ture that addressed this problem in adolescents, as separate from children and older adults. As it has only been within the last decade that the Amer¬
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