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?:definition
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GAIA Level 1 Cesarean Scar Pregnancy is defined by a transvaginal ultrasound that demonstrates the following five findings: first, an empty uterine cavity; second, an empty cervical canal, without contact with the gestational sac; third, the presence of a gestational sac, with or without a fetal pole, with or without cardiac activity, in the anterior uterine segment adjacent to the cesarean scar; fourth, an absence of or a defect in the myometrium between the bladder and the gestational sac; fifth, a well-perfused gestational sac as demonstrated by Doppler ultrasound (to differentiate from an expulsing, avascular gestational sac). Alternatively, Level 1 may be defined as a hysterectomy specimen with evidence of a pregnancy implanted into the cesarean scar.
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