2016 Volume 77 Issue 8 Pages 2111-2116
An adult case of sacrococcygeal mature teratoma is reported. A 38-year-old man with a tumor in the right buttock was referred to our hospital. CT and MRI identified a cystic tumor in the right buttock, located in front of the coccyx. There was no pre-existing increase in the level of serum tumor markers. The preoperative diagnosis was dermoid cyst of the buttocks, epidermoid cyst, tail gut cyst, or teratoma. A radical operation was performed. The operation involved extraction of the cystic region of the right buttock and coccyx, without collapsing the tumor in the jack-knife position. The tumor was a multicystic tumor, measuring 90 × 60 × 55 mm. Histopathological examination showed that the tumor was a mature cystic teratoma with a mucinous border. The patient's postoperative course was good, with no recurrence of the tumor and no neurological disorders.
In general, sacrococcygeal teratoma occurs in early childhood, with adult onset being very rare. A radical operation is needed in adult patients because of the possibility of malignant transformation.