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carcinoma
origin in epithelial tissue
sarcoma
mesenchymal origins (blood vessels, lymphatics, nerve tissue)
carcinoma in situ
neoplasm of epithelial tissue that remains confined to the site of origin
malignant fibrosarcomas
may originate from benign fibromas, bulky well differentiated tumor, rarely metastasize
bronchogenic carcinoma
90% of all cases CA, usually develops in lower trachea and lower bronchi, when there is metastasis: surgery is contraindicated