A rare complication seen at term during or shortly after labor in pregnancy resulting in sudden death is amniotic fluid embolism. Amniotic fluid may gain access to uterine veins following a tear in the placental membranes and embolize to the lungs, producing acute dyspnea with cyanosis and shock. Fetal squames, lanugo hair, vernix, and mucin can embolize to small pulmonary arteries. Seen here are epithelial squames in a peripheral pulmonary artery.