Teratoma
Teratomas are tumors derived from germ cells with multidirectional differentiation potential, often containing a variety of tissue components from the three germ layers, with disordered arrangement structures. According to their appearance, they can be divided into cystic and solid types; according to the degree of differentiation and maturity of their tissues, they can be divided into benign teratomas and malignant teratomas. This tumor most often occurs in the ovaries and testicles. It can occasionally be seen in the mediastinum, sacrum, peritoneum, pineal gland, etc.