Collision tumor of the stomach with carcinosarcoma and tubulo-papillary adenocarcinoma.

The present case is an autopsy case of a 66-year-old male who developed a collision tumor in the stomach which originated from carcinosarcoma of Borrmann type II in the gastric antrum and from papillary adenocarcinoma of Borrmann type III in the corpus. The carcinosarcoma consisted of tubular carcinoma and sarcomatous transformation of stroma from the carcinoma.