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Unusual Tumors of the Lung

Adenocarcinoma and squamous cell carcinoma are the most common histologic subtypes of lung cancer, comprising nearly 70% of primary lung neoplasms.1 The remaining subtypes consist of other uncommon epithelial tumors, including neuroendocrine tumors, salivary gland-type tumors, mesenchymal tumors, lymphohistiocytic tumors, and tumors of ectopic origin, as reclassified by the World Health Organization in 2015.2