Chronic hypertension superimposed on preeclampsia at 13 gestational weeks: a case report with review.

Preeclampsia is represented by hypertension and proteinuria in pregnancy. It usually occurs after 20 gestational weeks. There are few reports on preeclampsia before 20 gestational weeks. In this case, we report a patient with chronic hypertension superimposed with preeclampsia at 13 gestational weeks.