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True malignant mixed tumors (carcinosarcoma) of salivary glands.
In addition, multiple sections of the tumor showed residue benign mixed tumor, indicating that this true malignant mixed tumor (carcinosarcoma) may have arisen in a preexisting pleomorphic adenoma.
In summary, we report a case of true malignant mixed tumor (carcinosarcoma) of the parotid gland with rhabdomyosarcoma.
True malignant mixed tumor (carcinosarcoma) of the parotid gland: report of a case with immunohistochemical study.
There are 3 distinct histologic types of malignant mixed tumor: carcinoma ex pleomorphic adenoma, which comprises most malignant mixed tumors; metastasizing mixed tumors; and carcinosarcomas, which are true malignant mixed tumors.[21] In a clinicopathologic study of 146 cases of malignant mixed tumor of the salivary gland, the authors described occasional examples of clearly malignant spindle cell or mixed spindle cell and giant cell variant tumors, some of which exhibited predominantly diffuse pseudosarcomatous pattern.[16] However, carcinosarcoma was not used in that study, and the authors defined the use of malignant mixed tumor as those tumors containing elements of benign mixed tumor and carcinoma.