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Table 1 Summary of the characteristics of uterine effusion in the cases

From: Characteristics of fetal physiological and pathological uterine effusion observed on prenatal ultrasonography: a case report

Gestational Weeks (first observed)

Location of the mass

Maximum diameter (cm)

ultrasonograpy characteristics

Range

Internal blood flow

Postnatal diagnosis

Clinical management and prognosis

28

Between the bladder and the rectum

< 3

Isoechoic or hyperechoic, with myometrial echoes around

Smal, confined to the uterine cavity

undetected

physiological uterine effusion

subsides spontaneously after birth

28+ 2

between the bladder and the rectum

< 3

Anechoic with myometrial echoes around

Small, confined to the uterine cavity

undetected

physiological uterine effusion

subsides spontaneously after birth

33+ 5

Lower back of the raised bladder, in front of the rectum up to the lower abdominal cavity

> 5

filled with liquid and showed dense echogenic dots with thinner myometrial echoes around

Large, involving the cervix and vagina

undetected

iimperforate hymen with hydrometrocolpos

hymen puncture and open drainage led to good prognosis