月归档:六月 2011

Placental hydropic 胎盘水肿

Placental hydropic change seen here in the chorionic villi is accompanied by increased fetal erythroblasts and nucleated RBCs in fetal vessels in villi at the upper left. These changes can accompany any cause for fetal anemia, whether immune (erythroblastosis fetalis … 继续阅读

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Macrophages 巨噬细胞

If the fetus lives in utero following the meconium spillage, then the yellow-brown pigment can be taken up into macrophages in the membranes, as seen here, which can then give an indication that meconium was present in the amnionic cavity.

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Fetus in utero 胎儿在子宫中

Stress to the fetus in utero, whatever the cause, leads to reflex actions of the fetus such as loss of anal sphincter tone with passage of meconium into the amniotic cavity. The greenish-black meconium stains the fetal membranes and the … 继续阅读

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Trichrome stain 三色染色法

A trichrome stain demonstrates the fibrosis in the villi in this case of prolonged fetal demise. Syncytial knots may increase in number in the placenta during the first week following demise.

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The fibrosis of the villi 绒毛纤维化

There is marked involution of placental villi here because of prolonged fetal demise. Note the fibrosis of the villi. The villi are also quite small, even though this is a second trimester placenta. Such placental dysmaturity is a finding with … 继续阅读

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Increased pink collagen 粉红色胶原纤维增生

The placental villi here have increased pink collagen. This fibrosis here is a consequence of fetal demise.

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Fibrionid necrosis 纤维素样坏死

A decidual arteriole demonstrates atherosis consisting of prominent intimal macrophage proliferation along with fibrinoid necrosis (the irregular pink strands in the arteriolar wall) and edema. This decidual arteriopathy can be seen with pregnancy-induced hypertension (PIH) and with maternal antiphospholipid antibody.

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Villi 绒毛

The decidua is at the left, from which extends into the villi extensive deposits of fibrin, and the villi are becoming infarcted. This is known as maternal floor infarction. This condition can cause uteroplacental insufficiency and fetal demise. It is … 继续阅读

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Fibrin deposition 纤维素沉积

The cross section of the placenta seen here is quite abnormal, with a pale tan appearance. This represents the consequence of diffuse fibrin deposition, also associated with a condition known as maternal floor infarction, and sometimes called a “gitterinfarkt”.

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Placental infarct 胎盘梗塞

Microscopically, this placental infarct demonstrates pale, necrotic chorionic villi.

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