Abordagem da glicosúria renal na criança: a propósito de um caso clínico

Introduction : The accidental finding of glycosuria should lead to the exclusion of diabetes mellitus. In the absence of hyperglycemia, glycosuria is probably of renal origin. It can be isolated, as in familiar renal glycosuria, or it can be part of a hereditary tubular disorder such as Fanconi -Bickel syndrome or associated with an acquired tubular dysfunction. The renal and tubular function should be investigated. Case report : The authors describe the case of a previously healthy five -year old child with persistent glycosuria of renal cause. The investigation showed the coexistence of elevated renal excretion of glycine. Discussion : Familiar renal glycosuria and hyperglycinuria are caused by genetic defects in different renal tubular membrane transporters. The rare association of glycosuria and glycinuria was only described in one family in the 1960’s.The authors discuss the possible pathophysiologic mechanisms of this association and the importance of studying other tubulopathies in a child with glycosuria as it has prognostic and clinical management implications.