恶性苗勒管混合瘤（英语：malignant mixed Müllerian tumor），也称之为恶性混合性中胚叶瘤（malignant mixed mesodermal tumor, MMMT）、恶性中胚叶混合瘤、恶性中肾旁管混合瘤、或癌肉瘤（carcinosarcoma），是一种病发于子宫、卵巢、输卵管和其他组织的恶性肿瘤，该混合瘤中均包含上皮组织和结缔组织。这种疾病较为罕见，占所有子宫肿瘤的2-5%，发病年龄为平均66岁。依次好发于子宫、卵巢、输卵管及阴道。该病很少发生于生殖道以外的部位，生殖道以外部位的此疾病，多见于腹膜、大网膜。

A malignant mixed Müllerian tumor, also known as malignant mixed mesodermal tumor, MMMT and carcinosarcoma, is a malignant neoplasm found in the uterus, the ovaries, the fallopian tubes and other parts of the body that contains both carcinomatous (epithelial tissue) and sarcomatous (connective tissue) components. It is divided into two types, homologous (in which the sarcomatous component is made of tissues found in the uterus such as endometrial, fibrous and/or smooth muscle tissues) and a heterologous type (made up of tissues not found in the uterus, such as cartilage, skeletal muscle and/or bone). MMMT account for between two and five percent of all tumors derived from the body of the uterus, and are found predominantly in postmenopausal women with an average age of 66 years. Risk factors are similar to those of adenocarcinomas and include obesity, exogenous estrogen therapies, and nulliparity. Less well-understood but potential risk factors include tamoxifen therapy and pelvic irradiation.