choronic villi Image

villi including one with early fibrosis/lack of capillaries; some cytotrophoblast Image

in the SAB, the villi have already undergone loss of vascularization -- the center is pink/fibrotic and avascular; the intervillous space is largely devoid of red cells Image

sometimes a gestational sac (to the right) is also present. perivillous fibrosis is excessive (left) Image