• California Soc. of Pathology Criteria for Placenta Exams HERE
• A study of low rate of placenta pathology exams, even though criteria exist...HERE
• An outline of gross and microscopic findings  
• Acute chorioamnionitis pathology (ACA)
• Hemorrhagic endovasculitis (HEV)
• Chronic villitis

(posted 9 February 2002; latest update 4 October 2009)