Anterior sacral meningocele presenting as right adnexal cyst.

A 47-year-old woman presented with chronic pelvic pain for 6 months. There was no history of trauma or surgical operation. Pelvic ultrasound was performed and revealed an anechoic cyst in the right pelvic areas. The origin of the cyst could not be determined on ultrasound examination. Magnetic resonance imaging showed a thin-walled cystic lesion in the right adnexa. The lesion was not associated with the ovaries. Posteriorly, it was communicating with the spinal subarachnoid space (Figure, Top left, Top right, Bottom). Based on imaging findings, the patient was diagnosed with anterior sacral meningocele.