[A intraepithelial neoplasia (dysplasia) that arises in either the native gastric mucosa or in metaplastic gastric epithelium. It has a flat, polypoid or slightly depressed growth pattern. It is graded as low grade (mild dysplasia) or high grade (moderate dysplasia and carcinoma in situ). (WHO, 2000) — 2003 ( NCI )]
UMLS (NCI) C0267111