= neoplasm containing tissue belonging to all 3 germinal layers at sites where these tissues do not normally occur
Prevalence: 0.15% (excluding sacrococcygeal teratoma)
Age: all ages; M÷F = 1÷1
Path: solid thin- / thick-walled partially / wholly cystic space with clear / milky / dark cyst fluid; uni- / multilocular; presence of bone / cartilage
Location: intra- / extramedullary