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Prolapse of the amniotic sac ("hourglass membranes"): ultrasound appearance
Radiology
|August 1, 1981
Abstract:
Prolapse of the amniotic sac through the partially dilated cervical os in pregnancy is called "hourglass membranes." Ultrasonography may be useful in identifying the presenting fetal or intra-uterine parts within the bulging membranes.
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