Hydrocolpos

Hydrocolpos is the distension of the vagina caused by accumulation of fluid due to congenital vaginal obstruction. The obstruction is often caused by an imperforate hymen or less commonly a transverse vaginal septum. The fluid consists of cervical and endometrial mucus or in rare instances urine accumulated through a vesicovaginal fistula proximal to the obstruction.

Before puberty
If it occurs in prepubertal girls, it may show up as abdominal swelling.

Diagnosis
It may be detected by using ultrasound. It may also present at birth as a distended lower abdomen and vagina.

Treatment
Drainage.