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Radiographic assessment

Ultrasound

Findings diagnostic of pregnancy failure ...
• crown-rump length (CRL) of ?7 mm and no heartbeat on a transvaginal scan
• mean sac diameter (MSD) of ?25 mm and no embryo on a transvaginal scan
•absence of embryo with heartbeat ?2 weeks after a scan that showed a gestational sac without a yolk sac
•absence of embryo with heartbeat ?11 days after a scan that showed a gestational sac with a yolk sac

Findings suspicious but not diagnostic of pregnancy failure
• crown-rump length (CRL) of <7 mm and no heartbeat
• mean sac diameter (MSD) of 16-24 mm and no embryo
•absence of embryo with heartbeat 7-13 days after a scan that showed a gestational sac without a yolk sac
•absence of embryo with heartbeat 7-10 days after a scan that showed a gestational sac with a yolk sac
•absence of embryo ? 6 weeks after last menstrual period
•amnion seen adjacent to yolk sac, with no visible embryo (empty amnion sign)
•enlarged yolk sac (>7 mm)
•small gestational sac in relation to the size of the embryo (<5 mm difference between mean sac diameter and crown-rump length) princess ball styled gown of wedding
•large amniotic cavity (expanded amnion sign)

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