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FETAL ASCITES A Report of 3 Autopsy Cases

Three rare autopsy cases of fetal ascites were presented and the etiology of each case was described. Case 1 was a male neonate, delivered by cesarean section at 32 weeks’gestation, and died of respiratory failure. The abdomen was remarkably distended with 1020 ml of ascites. The etiology of Case 1 remained unknown even after macroscopic and microscopic examinations. We considered this as “idiopathic” fetal ascites. Case 2 was a female neonate, delivered at 31 weeks’gestation, with marked abdominal distension and cyanosis. Autopsy revealed 435 ml of ascites, and she was considered to have had “polysplenia syndrome” with cardiovascular malformations. Intrauterine heart failure due to cardiac anomalies was thought to be the cause of this ascites. In case 3 embryotomy was carried out under the diagnosis of fetal ascites by ultrasound examination at 22 weeks’gestation. An urachal cyst connected to the dilated urinary bladder and deficiency of musculature of the abdominal wall composed of loose connective tissue with calcification were observed. The abdominal wall was ruptured and 1,960 ml of ascites was measured. Polycystic kidney with renal dysplasia was also found. Case 3 showed “Prune‐Berry syndrome” and fetal ascites may have arisen from these anomalies.