Teratomas are a common form of GCT. They are defined histologically as containing tissues derived from all 3 germ cell layers: ectoderm, mesoderm (most teratomas contain fat, an imaging hallmark, which is a mesodermal derivative), and endoderm. Teratomas are also classified as mature or immature, depending on the degree of differentiation of its components. Teratoma is an uncommon neoplasm with an incidence of 0.9/100,000 population. Common sites for teratomas in infancy and children are extra-gonadal like mediastinal, sacro-coccygeal and pineal regions. In adults, they are mainly gonadal. Retroperitoneal teratoma is rare and comprises of about 1% of all teratomas. In more than 50% of cases, mature teratomas have no symptoms at initial diagnosis and are detected by chance. Teratomas have already been reported in different locations, ranging from intracranial, thoracic, abdominal compartments, to ostiomuscular and spinal compartments.

Present a brief review of teratoma and its possible locations. Demonstrate, through imaging, some common and rare sites of teratomas, available in our digital archive.