There is debate over the naming of MMMT; the term carcinosarcoma was formerly used to describe lesions with homologous<unk> s, and "malignant<unk> " or<unk>  mesodermal<unk> " was used to describe heterologous<unk> s. While "carcinosarcoma" now considered standard, "malignant<unk> " has a lengthy history within gynecological literature and is expected to continue to be used. The naming issue to a certain extent reflects histological characteristics and development of the<unk> s, in which the different types of tissues are believed to either develop separately and join into a single mass (the "collision" theory), that an adenocarcinoma stimulates the stroma to create a<unk>  (the "composition" theory), or that the<unk>  is the result of a stem cell that differentiates into different cell types (the "combination" theory). "Collision"<unk> s are normally easily recognized and not considered true MMMTs; the "combination" theory is most widely held, and is due to evidence that the<unk> s develop from a single line of cells, developing in a fashion similar to the fundus of the uterus from the<unk>  duct - first from a stem cell into a population of cells, that then differentiates into epithelial and stromal components. There is evidence that some<unk> s are better explained by the composition theory, due to the aggressive nature of the epithelial cells involved which tend to metastasize much more readily than the sarcomal component. The behavior of MMMT overall is more related to the type and grade of the epithelium than the sarcoma, which suggests the sarcomal portion is an atypical "bystander" than primary driver of the<unk> . Despite this, when purely endometrial<unk> s are compared to MMMTs, the MMMT<unk>  tends to have a worse prognosis.
Mixed Müllerian tumor
Leydig cell tumour
Theca lutein cyst
Epididymal cyst
Gonadoblastoma
Ovarian germ cell tumors
Corpus luteum cyst
Endolymphatic sac tumor