Inherited metabolic diseases resulting in urolithiasis secondary to urinary excretion of insoluble substances are rare but often present as urinary obstruction of renal insufficiency. We herein report a case of partial adenine phosphoribosyltransferase deficiency associated with 2, 8-dihydroxyadenine urolithiasis. In family members the propositus and his younger brother are homozygotes for defective APRT genes, and who exhibits the type II phenotype designated APRT*J (Japanese type)
