To define the frequency of gastric epithelial dysplasia (precancerous lesion), 1463 biopsies from 842 endoscopically studied patients were reassessed. Mild dysplasia was found in 19.9 % of the cases, moderate in 4.1 %, severe in 0.95 %. Since the clinical and biological significance of the lesion is still an open question, indications for follow-up are discussed in the light of personal views, together with a critical evaluation of the recently proposed classifications.
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