Retrorectal teratoma: a rare cause of pain in the tailbone.

Retrorectal tumors are extremely rare and heterogeneous, requiring complete surgical excision for definitive diagnosis and optimal outcome. We describe a patient presenting with chronic "tailbone pain" who was found to have a benign cystic teratoma in the presacral space. She underwent en bloc resection and recovered well. Radiographic and pathologic images from this unique case are depicted and clinical features discussed.