Overview of Gross and Microscopic Changes Umbilical Cord Gross Evaluation and Normal Histology of Umbilical Cord Knots Umbilical Cord Edema and Thinning Histopathologic Changes of Umbilical Cord Extraplacental Membranes Gross Evaluation and Normal Histology of Membranes Histopathologic Changes of Membranes Chorionic Plate Gross Evaluation and Normal Histology of Chorionic Plate Histopathologic Changes of Chorionic Plate Stem Villi Gross Evaluation and Normal Histology of Stem Villi Histopathologic Changes of Stem Villi Chorionic Villi Gross Evaluation and Normal Histology of Chorionic Villi Histopathologic Changes of Chorionic Villi Septae, Intervillous Space, and Basal Plate Gross Evaluation and Normal Histology of Septae, Intervillous Space, and Basal Plate Histopathologic Changes of Septae, Intervillous Space, and Basal Plate Decidua Gross Evaluation and Normal Histology of Decidua Histopathologic Changes of Decidua Placental Diagnoses Meconium Meconium-Stained Placenta Amniotic Fluid Infection Sequence Amniotic Fluid Infection Sequence (Maternal and Fetal Inflammatory Response) Group B Streptococcus Other Bacterial and Mycobacterial Species Candida Placental Infections With Villitis and Other Findings Cytomegalovirus Parvovirus B19 Herpes Simplex Virus Other Viruses Syphilis Coccidioidomycosis Parasites Chronic Inflammatory Lesions Cellular Composition of Chronic Inflammatory Lesions Chronic Villitis and Intervillositis Basal Chronic Villitis and Chronic Deciduitis Chronic Chorioamnionitis Eosinophilic/T-Cell Chorionic Vasculitis Massive Perivillous Fibrin Deposition and Maternal Floor Infarction Massive Perivillous Fibrin Deposition and Maternal Floor Infarction Fetal Vasculopathy Large Vessel Fetal Vascular Occlusion Distal Villous Lesions Associated With Fetal Vascular Occlusion Placental Abruption Acute Abruption and Retroplacental Hematoma Chronic Abruption Villous Hypervascular Lesions Chorangiosis Chorangiomatosis Chorangioma Gestational Trophoblastic Disease and Metastatic Tumors Hydropic Degeneration Mole Partial Hydatidiform Mole Complete Hydatidiform Mole Choriocarcinoma Placental Site Nodule and Exaggerated Placental Site Placental Site Trophoblastic Tumor and Epithelioid Trophoblastic Tumor Metastatic Tumors Placental Mesenchymal Dysplasia Placental Mesenchymal Dysplasia Placental Evaluation in Special Circumstances Gestational Diabetes Gestational Diabetes Placentomegaly Distal Villous Immaturity Preeclampsia and Uteroplacental Malperfusion Preeclampsia and Related Hypertensive Disorders Small for Gestational Age Placenta Distal Villous Hypoplasia Maternal Decidual Vasculopathy Infarcts Extravillous Cytotrophoblast Cysts Laminar Decidual Necrosis Fetal-Maternal Hemorrhage Fetal-Maternal Hemorrhage Intrauterine Growth Restriction Placental Causes of Poor Fetal Growth Prematurity Placental Findings in Premature Birth Abnormal Placental Implantation Placenta Accreta Intrauterine Fetal Demise 1st-Trimester Pregnancy Loss 2nd-Trimester Fetal Demise 3rd-Trimester Fetal Demise Recurrent Pregnancy Loss In Utero Demise to Delivery Interval Changes Hypoxic Ischemic Encephalopathy Multiple Gestations Complications of Monochorionic Monoamniotic Twin Gestations Twin Growth Discrepancy Twin-Twin Transfusion Syndrome Twin Anemia-Polycythemia Sequence After In Utero Intervention for Twin-Twin Transfusion Syndrome Triplet and Higher Order Placenta Maternal Complications of Pregnancy Maternal Mortality Evaluation of Postpartum Hysterectomy Postpartum Hemorrhage Appendix Reference Charts for Placental Evaluation Weights for Singleton Placentas Weights for Twin Placentas Weights for Triplet Placentas Reference Values for Fetal and Placental Growth in Early Pregnancy Sample Templates for Placental Evaluation Singleton Placenta Gross Evaluation Twin Placenta Gross Evaluation Placenta Microscopic Evaluation Placenta Triage.