A Triton tumor mimicking sacrococcygeal teratoma.

A newborn female infant delivered after a normal pregnancy was found to have a large sacrococcygeal mass. Imaging and laboratory studies suggested this was a sacrococcygeal teratoma. On the 16th day of age, the tumor was completely removed. Histopathologic examination of the tumor showed malignant Triton tumor (MTT). Thus, we describe a female newborn without a family history of neurofibromatosis with an MTT that mimics a sacrococcygeal teratoma. To our knowledge, this is the first report of a sacrococcygeal MTT detected in a neonate.