Case contributed by Townsville radiology training


A pelvic cyst was demonstrated on antenatal scan. ?ovarian ?duplication cyst

Patient Data

Age: 3 days
Gender: Female

Three selected images of the pelvis show a cystic structure with homogeneous echoes lying between the bladder (compressed) and the rectum. There is a rounded structure in the apex of the cyst.


The structure of the cystic mass is demonstrated. Note the outpouching at the apex corresponding to the mass seen on ultrasound. Note the tapered appearance of the inferior end of the cyst.

Case Discussion

This case demonstrates hydro/hematocolpos. The mass at the superior end of the cyst is the cavity of the uterus. If pressure in the system is high the uterine cavity may be opened out. The pressure here is not high and there is a suggestion that the lower end of the cyst actually has a small leak as shown by signal arising just below the tapered end.

Final diagnosis: Congenital hydrocolpos due to marked stenosis of the introitus.

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