A female patient has adenocarcinoma uterus along with sarcoma of uterus. It is known as:
Mixed mullerian carcinoma is a mixture of both carcinomatous and sarcomatous element.           

Represent 50% of all uterine sarcoma.
Most common combination is of serous carcinoma with endometrial sarcoma.
Most commonly occur in postmenopausal women.

Remember:

Most common histologic type of uterine sarcoma is carcinosarcoma.
Most common symptom of uterine sarcoma is bleeding.
Surgery is main stay of treatment followed by chemotherapy.

Also know:
Heterologous tumors: If sarcoma component of mixed mullerian tumors mimic extra uterine tissue (viz - striated muscle cell, cartilage, adipose tissue and bone) it is known as Heterologous tumor.
Homologous tumor: If mesenchymal/ sarcomatous component of mixed mullerian tumor consists of malignant endometrial or smooth muscle differentiation, the term homologous is used.
Homologous sarcoma
Sarcoma uterus
Mixed Mullerian carcinogenesis
Heterologous sarcoma
Mixed Mullerian carcinogenesis