Tarlov Cyst with Pelvic Extension Mimicking an Adnexal Mass: A Case Report.

Pelvic extension of sacral Tarlov cysts can closely resemble adnexal masses on ultrasound. When cystic pelvic lesions coexist with radicular pain or sitting intolerance, MRI is mandatory prior to gynecologic surgery. Conservative treatment is preferred unless neurological deterioration occurs.