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  • Title: Outcome of twin gestations complicated by a single anomalous fetus.
    Author: Malone FD, Craigo SD, Chelmow D, D'Alton ME.
    Journal: Obstet Gynecol; 1996 Jul; 88(1):1-5. PubMed ID: 8684738.
    Abstract:
    OBJECTIVE: To compare the outcome of twin gestations complicated by a single anomalous fetus with twin gestations with no fetal anomalies. METHODS: The study included all patients with twin gestations diagnosed with a fetal anomaly in one fetus during 1990-1994, and excluded twin gestations with anomalies in both fetuses. The control twin group was composed of all other normal twin pregnancies followed and delivered at our center in the preceding 2 years. RESULTS: We reviewed 24 twin gestations with at least one anomalous fetus. Five cases were excluded because of anomalies in both fetuses, and a further five pregnancies had selective termination or termination of the entire pregnancy. There were 14 ongoing twin pregnancies with one anomalous fetus, and their median gestational age at diagnosis was 18 weeks (range 16-20). All twin anomalies were correctly diagnosed antenatally. Gestational age at delivery and birth weight were significantly lower for twins complicated by an anomaly compared with control twins (P = .008 and P = .001, respectively). The cesarean delivery and perinatal mortality rates of twin pregnancies with anomalies were significantly higher than those of normal twins (P = .01 and P < .001, respectively). CONCLUSION: The presence of a single anomalous fetus in a twin gestation significantly increases the risk of preterm delivery compared with nonanomalous twin gestations.
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