(A) Hematoxylin/eosin-stained section of placenta showing normally vascularized villi (arrow) and adjacent field of avascular villi, distal vessel–fetal thrombotic vasculopathy (arrowheads). Magnification: 20×. (B) Hematoxylin/eosin-stained section of a stem villous vessel showing an endothelial cushion with a cap of a fibrin clot, large vessel–fetal thrombotic vasculopathy, arrow. Magnification: 40×. Placental Pathology Associated with Household Air Pollution in a Cohort of Pregnant Women from Dar es Salaam, Tanzania: Environmental Health Perspectives. Not altered. CC.