60 patients were studied 3 months to 4 years after pregnancy. All had high blood pressure, gross proteinuria, and edema. In many cases, typical glomerular lesions and proteinuria disappeared rapidly. When arteriolar lesions are of grade I or II, they progressively disappear or remain unchanged and blood pressure returns to normal values. When arteriolar lesions are of grade III (endotheliitis, hyperplasia and edema of the media and subendothelial deposits), blood pressure remains at a high level or increases, without changes during the time of observation of the arteriolar lesion or of renal function.