Fig. 4

Histopathological findings. a Transitional zones (black arrowhead) between the carcinomatous (yellow arrowhead) and sarcomatous components (green arrowhead) were observed in the tumor. b The adenocarcinoma component was found in the mucosa of the stomach. c The venous invasion found in the submucosa consisted of adenocarcinoma cells. Immunohistochemical findings. d The tumor was positive for vimentin. e The carcinomatous components (red arrowhead) were positive for cytokeratin CAM5.2 and the sarcomatous components (yellow arrowhead) were partly positive for cytokeratin CAM5.2 (black arrowhead). Histopathological findings of rhabdomyosarcoma. f The tumor contained cells with eosinophil-abundant cytoplasm. g The cells with eosinophil-abundant cytoplasm were positive for desmin