We describe the rare cases of a 44-year-old woman and a 28-year-old woman each presenting with a large posterior sacrococcygeal mass and alternating symptoms of high and low intracranial pressure. The first patient underwent excision of her large sacral meningocele and simple ligation of the neck, resulting in resolution of all her associated symptoms. The second patient suffered traumatic rupture of the meningocele; she underwent excision of the redundant sac and repair of the dural defect using a musculofascial flap, also resulting in resolution of her symptoms.