Introduction Spontaneous septostomy (SS) in monochorionic diamniotic pregnancy (MD) is an uncommon severe event. Aetiology of SS waveforms within that loop of cords by colour Doppler (Chadha et al. 2012). In conclusion, it is important to detect the two insertions of the umbilical cords and their distance; to scan the whole length of the inter-twin dividing membrane in twin pregnancy at every scan, along with a search for evidence of CE; to counsel appropriately the couple to 'let them prepare' for adverse events; to manage PMM as the MM.Declaration of interest: The authors report no conflicts of interest The authors alone are responsible for the content and writing of the paper.
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