Five children from 3 different families, presented several attacks of hemolytic-uremic syndrome with peculiar features:--in 4/5 children the disease was familial; 4 presented 2 attacks, the 5th 3 attacks, separated by several months or years of time-interval;--the "bouts" were constantly marked by the initial high level of reticulocytes, rapid recovery of hematuria, renal failure and thrombocytopenia;--overall, repeated biopsies of the kidney never showed any lesion of the basement membrane of the glomerular capillaries or of the arteriolar walls leading to the diagnosis of thrombotic microangiopathy;--all etiological enquiries to precise the cause of chronic hemolysis were negative.
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