Sacrococcygeal teratoma (SCT) is one of the most common congenital tumors, with a reported incidence 1 in 40,000 births. Sacrococcygeal teratoma can be diagnosed prenatally on a detailed ultrasonogram.
The majority of these tumors appear to be solid or mixed cystic, external caudal masses. According to the literature reports, only a small percentage of these tumors are entirely cystic and located internally without an external component. The differential diagnosis for this unique presentation of sacrococcygeal teratoma is different from that for predominantly external, complex tumors. We describe an unusual case of a huge, cystic, sacrococcygeal teratoma inside the abdomen, which was mistaken for a lymphangioma or cystic neurogenic tumor. We present this case along with a brief review of the literature.