[Analysis of gastric biopsy specimens group III by a revised group classification].

A revised group classification of histology in gastric biopsy specimens was recently proposed by the Japanese Research Society For Gastric Cancer. The specimens judged as Group III by the revised classification contained; adenoma that used to be judged as Group III by the former classification, lesions difficult to distinguish between adenoma and carcinoma, lesions difficult to distinguish between atypical regenerative epithelium and carcinoma, and so on. Pathologists are requested to describe whether the lesion is adenoma or not and to consult with clinicians about the lesion in order to reduce the possibility that a case of well-differentiated adenocarcinoma is misdiagnosed as Group III by the revised classification.