Suggest the diagnosis according to the microscopic description. I-I-E staining: The tumor is composed of highly differentiated tissue elements from the three germinal cell layers -- mesodermal layer (connective tissue, collagen fibres, fatty tissue, cartilage and others), endodermal layer (glands) and ectodermal layer (skin, columnar epithelium, stratified squamous epithelium, brain substance). They create a variety of the morphological picture. There isn't any sign of cell atypia. Cystic changes are often seen.
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