Synchronous collision malignant melanoma and adenocarcinoma of the rectum

  title={Synchronous collision malignant melanoma and adenocarcinoma of the rectum},
  author={Andr{\'e} Roncon Dias and Rodrigo Ambar Pinto and Eduardo Kenzo Mory and Izabel CR Silva and Sheila Aparecida Coelho Siqueira and S{\'e}rgio Carlos Nahas and Ivan Cecconello and Steven D. Wexner},
  journal={Techniques in Coloproctology},
“Collision tumors” consist of two independent but coexisting tumors. This uncommon situation might be easily mistaken for a composite tumor where one histogenetic event originates from two apparently distinct neoplasms. Colorectal collisions are particularly unusual; here, we report the exceedingly rare case of a 61-year-old man with malignant melanoma and adenocarcinoma colliding in the rectum. Collision tumors have an idiopathic pathophysiology and in fact “accidental meeting” is accepted by… CONTINUE READING

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