Fig. 2

Placenta and its pathological examination. a Placenta by naked eyes. The volume is 18 × 13 × (1.5–2) cm, with sections of dull-red color and complete placental membrane, no cyst can be found. b Chorionic villi of placenta under microscope (HE × 200). Mild edema and increased syncytial cell nodules can be seen in partial villi, indicating placental dysfunction. c A chorionic blood vessel under microscope (HE × 400). Chorionic blood vessel presents hyaline degeneration and fibrous necrosis, according with the diagnosis of hypertension. d Umbilical artery under microscope (HE × 400). There is only one artery in umbilical cord, with a thickened wall and a narrow lumen, according with the diagnosis of single umbilical artery