a = new Array(11); a[0] = "Incorrect" a[1] = "CORRECT. The green color suggests meconium spillage, an event associated with fetal distress around term, and there may be meconium aspiration." a[2] = "CORRECT. The neutrophilic infiltrates are consistent with a bacterial infection. One of the most common organisms under these circumstances is group B strep." a[3] = "CORRECT. This is immune hydrops, probably from Rh incompatibility, resulting in maternal antibody crossing the placenta and destroying baby's RBC's through complement mediated lysis, a form of type II hypersensitivity reaction. The villi are large and pale (hydropic) and some of the vessels are filled with nucleated red blood cells." a[4] = "CORRECT. This is a velamentous insertion of the umbilical cord. When the vessels are free in the membranes, then they are more easily traumatized during delivery." a[5] = "CORRECT. There is a vascular anastomosis across the dividing membranes. One twin becomes the 'donor' and the other becomes the 'recipient' of the blood, resulting in the size differential. There is an increased risk for death, most often of the recipient." a[6] = "CORRECT. Note the two chorions that are apposed in the center. There is no inflammation." a[7] = "CORRECT. In a complete mole, the fetus is absent, because no maternal chromosomes are present. Triploidy may have a partial mole in which some of the villi are grape-like, but a fetus is present." a[8] = "CORRECT. In placenta accreta, there is no normal decidual plate, and the placenta is implanted directly into the myometrium. In this case, the placenta has grown all the way through the wall of the lower uterine segment, a placenta increta." a[9] = "CORRECT. This is a pseudoknot, which is just an exaggeration of one of the fetal vessels. The vessel takes the form of a 'clothoid loop' which keeps centrifugal force constant around the loop, something that roller coaster designers took years to invent." a[10] = "CORRECT. This is a classic history of premature placental separation. A blood clot forms behind the placenta. The maternal-fetal circulation is compromised." a[11] = "QUESTIONS: 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 "