<prompt> Sacrococcygeal teratoma is a derivative ofPrimitive streakHypoblastEctodermCranial neuropore  <response>: Sacrococcygeal teratoma: - Sometimes remnants of the primitive streak persist in the sacrococcygeal region. Then cluster of pluripotent cells proliferate form tumor, known as sacrococcygeal teratomas Which commonly contain tissues derived from all three germ layers. Occurrence 1: 37,000 Most common tumor in a new born. Teratomas may also arise from abberent migration of primordial germ cells. 