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True pulmonary carcinosarcoma (squamous cell carcinoma and chondrosarcoma). A case report.
Acta Pathologica Japonica 1992 October
True pulmonary carcinosarcoma (squamous cell carcinoma and chondrosarcoma) originating in the right lower lobe in a 62-year-old Japanese male is reported. The tumor, measuring 5.5 x 3.5 x 3.5 cm, was markedly necrotic and its apex protruded into the bronchial lumen. Light microscopy showed that the tumor was composed of squamous cell carcinoma with sarcomatous spindle or polygonal cell proliferation and true chondrosarcoma. Immunohistochemically, the cytoplasm of numerous cells of the squamous cell carcinoma component was stained with anti-cytokeratin (PKK 1) and the cytoplasmic membrane with anti-epithelial membrane antigen (EMA). Although sarcomatous regions were stained with anti-vimentin (vimentin) and no tumor cells were reactive for EMA, a few tumor cells were positive for PKK 1. The cytoplasm of numerous chondrosarcoma cells was positively stained for vimentin and S-100 protein. Based on these findings, we concluded that the present tumor was a true carcinosarcoma composed of squamous cell carcinoma with sarcomatous regions and true chondrosarcoma.
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