Coexistence of carcinoid tumor and adenocarcinoma of the lung; morphological, immunohistochemical and genetic analyses, a case report
Abstract Background Pulmonary carcinoid tumors rarely coexist with non-small cell lung carcinoma, and only nine cases have been reported previously.The pathogenesis and origin of these combined tumors remain unclear because of its rarity.Case presentation We examined two cases of adenocarcinoma coexisting with a typical or atypical carcinoid tumor: