Concurrent Occurrence of Adenocarcinoma and Carcinoid Tumor in the Stomach: A Composite Tumor or Collision Tumors?

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Abstract
A morphologic curiosity is presented in a polypoid gastric tumor combined with adenocarcinoma and carcinoid tumor. It is likely that those two represent a composite tumor; however, the authors think it is more likely that they are two concurrent, independent collided tumors.