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The distribution of benign and malignant neoplasms of the lung is as follows: Carcinoma 90% (approx. 80% are non-small cell carcinomas and 10% are small cell carcinomas); bronchial carcinoids 5%; mesenchymal and other miscellaneous neoplasms 5% (benign tumors such as hamartomas and malignant tumors such as sarcomas and lymphomas). Source: Pathologic Basis of Disease, 9th Edition.