Preeclampsia is thought to be discordant in monozygotic twins. While recrui
ting for a genetic study into preeclampsia, we identified 4 sets of twins a
nd a triplet gestation; all were monozygous on deoxyribonucleic acid "finge
rprinting." Two twins were concordant for preeclampsia, and 2 of the triple
ts had pregnancy-induced hypertension, although only 1 of them had proteinu
ria. Hence we confirm the existence of monozygotic twins that are concordan
t for preeclampsia.