(1) Two cases of thrombotic thrombocytopenic purpura (TTP) occurring in childhood are described. Case 1 is unique in that the patient survived for 12 years.
(2) The clinical features of 19 reported cases of TTP in children are reviewed.
(3) The presence of morphologic abnormalities of red blood cells and the regular occurrence of kidney involvement in this disorder is emphasized. In one patient (Case 2), histologic changes of the disease were limited to the kidney.
(4) Certain hematologic and histologic features shared by TTP and eclampsia are described.
(5) Unusual histologic lesions of renal vessels are described.
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