Teratoma is pathologically defined as a tumor composed of different parenchymal tissues originated from more one germinal layer and dermoid cyst is a type of which containing only of ectodermal tissues. The most common sites of this tumor are ovary, orbit, mediastinum and brain. Nowadays these tumors are diagnosed pre-operatively with new imaging modalities such as CT & MRI and their most important features are their fat & calcium components. In this review article, 19 cases and their CT images are presented.
