[Staging and response evaluation of gastric cancer: requirements and resolutions by multidisciplinary treatment]

The popularization of the multidisciplinary treatment has brought more demands to the radiological evaluation of the gastric cancer, which includes staging and response evaluation. Limited by the resolution, the present imaging modalities can not demonstrate tiny structures of the serosa, and the employment of the hyperattenuating serosa sign may improve the diagnostic performance of T4a. The spectral CT and diffusion weighted MRI may provide new potential methods for the staging of gastric cancer. Attention should be paid to the unresectable signs caused by the dispersed infiltration of adjacent fat space to the organs. The comprehensive evaluation of peritoneal metastasis should base on the sites and early signs. Diffusion weighted MRI may provide new indicator for the response evaluation of gastric cancer to neoadjuvant chemotherapy.