Epithelial Tumors of the Gastrointestinal Tract: Definitional Problems Regarding Morphologic Terminology

These are Major terminological problems relating to definitions of epithelial tumors of the whole gastrointestinal tract (squamous and glandular). Furthermore, the clinical implications vary from site to site. The definitional problems primarily involve epithelial atypia and the terminology of neoplastic lesions, namely dysplasia, adenomas, carcinoma in situ, and early cancer [1–8].