双侧卵巢成熟囊性畸胎瘤，是来源于生殖细胞的肿瘤。组织学上，可见多种成熟组织成分。这些肿瘤常常被称为“皮样囊肿”，因形成囊状。

Here are bilateral mature cystic teratomas of the ovaries. These are a form of ovarian germ cell tumor. Histologically, a variety of mature tissue elements may be found. These tumors are often called "dermoid cysts" because they are mostly cystic.