We report an example of sacrococcygeal teratoma presenting as a "supernumerary limb" in the left gluteal area with a rudimentary hemipelvis, femur, tibia, fibula, and tarsal bones. This monocephalus tripus dibrachius-appearing complex with associated with a deep seated but separate pararectal mature teratoma. This combination of a well-developed external limb with a deep but separate teratoma has been described.