Methods: In this quasi experimental study, placentas from pregnancies with PP and
normally implanted controls (n=10) were obtained from women who underwent cesarean
section. Three full-thickness columns of each placenta were sampled using
systematic uniform random sampling (SURS). Columns were cut into slices and
slices were sectioned with 4 μm thickness. SURS selected sections were stained by
Masson’s trichrome. Stereological analysis was done on 8-10 SURS microscopic
fields of each section. Absolute volume and volume density of chorionic villi, intervillous
space, syncytiotrophoblast, fibrin and blood vessels in chorionic villi were estimated
in both groups. Statistical analysis was done using Mann Whitney-U test and
significant level was set at p