Abstract
Background. Unexplained intrauterine death (IUD) remains the most common cause of perinatal death in babies of 24 weeks’ gestation. Results. The total sample ( N =822) comprised 60.9% live-birth placentas and 39.1% IUD placentas. In the IUD group, the cause of death was clinically unexplained in 55.9% of cases. Histopathology identified in this group included chorioamnionitis (CA) (34.5%), maternal vascular malperfusion (32.1%), abruptio placentae (31.5%), delayed villous maturation (17.8%) and toxoplasmosis, other agents, rubella, cytomegalovirus and herpes simplex (TORCH) infections (6.1%), most commonly syphilis. No pathology was found in only 2% of IUD cases. Among live births, preterm labour accounted for 41.9% of placental submissions, of which the cause was unknown in 46.2% of cases. Clinically indicated and histologically defined CA was poorly correlated. Conclusion. This study demonstrates the value of placental histopathology in cases of adverse perinatal outcome.
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