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Heterologous tumors consist of a differentiated mesenchymal component accompanied by endometrial, stromal or undifferentiated sarcomas.
4-6,9-11) MMMTs are sub-divided into homologous and heterologous tumors.
In heterologous tumors, sarcomatous elements that have no benign counterpart in the uterus are present, such as skeletal muscle, bone and cartilage.