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Hematometrocolpos refers to a blood-filled distended uterus and vagina usually due to an anatomical mechanical obstruction precluding the evacuation of the menstrual blood.
The estimated incidence in teenagers is at ~1 in 1000-2000 5.
imperforate hymen: in ~2/3 of cases
may show a distended midline cystic structure between the bladder and the rectum
internal echotexture can be variable; often low-level echoes may be seen
associated hydrosalpinx may be seen
examination of the kidneys should be performed to screen for obvious associated urological tract malformation, commonly associated with Müllerian malformations
distended uterine cavity, cervical cavity, and vagina with T1W and T2W hyperintense contents
Treatment and prognosis
If large enough it can cause:
obstruction of regional lymph drainage