been shown that the age and parity of the mother
can affect the number and vascularity of placental
villi. Apart from blood flow, the activity of various
growth-promoting hormones, such as insulinlike
growth factor or placental growth factor,
plays a role in supporting normal placental development
(18). As means of age and parity of our
PP patients were similar to the control group, the
growth factor probably can cause vascular volume
differences. This could be an important subject for
future research in this field