Perinatal outcome in monoamniotic twin pregnancies during a 10-year period: a single center, descriptive study

Abstract

Purpose To retrospectively investigate perinatal outcome of monoamniotic twin pregnancies in a tertiary center during a 10 year period. Methods A retrospective analysis of all monoamniotic pregnancies managed at Karolinska University Hospital, Stockholm, Sweden 2010–2019 was performed. The primary outcomes were live birth rate, neonatal death and perinatal survival. The secondary outcomes were late miscarriage, gestational age at delivery and frequency of fetal complications. Results Twenty-two monoamniotic pregnancies, with 44 fetuses, were identified. Thirty-five of 44 fetuses (80%) were liveborn. Of 36 fetuses reaching 24 weeks gestation, 35 (97%) were liveborn. There were no neonatal deaths, thus the perinatal survival was 97%. The mean gestational age at birth was 32.5 weeks (SD ± 1.5). Conclusions The live birth rate and perinatal survival of monoamniotic pregnancies managed at Karolinska University Hospital was high and comparable to previously published data.

Mirror, mirror? An evaluation of identical twin mirroring in tooth crown morphology

“…The result is a rare set of monochorionic monoamniotic MZ twins (Hall, 2003; McNamara et al, 2016). This final timeline is associated with certain vascular health risks, and in cases of severely delayed separation, the development of conjoined twins (Cordero et al, 2006; Kaufman, 2004; Post & Heyborne, 2015; Söderhult et al, 2023). Conjoined twins are thought to arise when incomplete embryonic plate separation occurs after days 13–14 (Hall, 2003; but see Post & Heyborne, 2015).…”