Abstract
Maternal floor infarction of the placenta is a relatively rare disorder that on gross examination is characterized by a thickened gray-yellow maternal floor of the placenta with histologic evidence of massive fibrin deposition involving the decidua basalis and the contiguous villi. This lesion has been associated with fetal death, preterm delivery, and intrauterine growth retardation and is thought to be recurrent. Sixty cases of maternal floor infarction were identified in 48 women. Fetal death occurred in 24 of the 60 cases (40%). Preterm birth occurred in 21 of 36 (58.3%) live-born infants, and 19 of the 35 (54.2%) live-born infants for whom a birth weight was known had evidence of intrauterine growth retardation. Among the 41 multiparous patients in our series there were five documented recurrences (12.2%). Review of the past reproductive history of these 48 patients (196 pregnancies) demonstrated a significant incidence of fetal death (24.1%), intrauterine growth retardation (31.3%), and preterm death (35.4%). The association of fetal death and maternal floor infarction emphasizes the importance of a placental examination with all cases of fetal death and infants with intrauterine growth retardation. Given the risk of recurrence, the identification of maternal floor infarction should alert the clinician to the potential for growth retardation, preterm birth, and fetal death in subsequent pregnancies.
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