[These are circumscribed lesions, composed of tubular and/or villous structures showing intraepithelial neoplasia. The frequency of malignant transformation depends on the size and the histological grade. It occurs in approximately 25% of lesions measuring 2 cm. Gastric adenomas are classified as tubular, tubulovillous, and villous. — 2003 ( NCI )]
UMLS (NCI) C0149826