Non-multiple lymphomatous polyposis form of mantle cell lymphoma in the gastrointestinal tract.

Mantle cell lymphoma (MCL) comprises 2.5%-7% of all non-Hodgkin's lymphomas, and the gastrointestinal tract is involved in about 20% of cases. Multiple lymphomatous polyposis (MLP) is an uncommon disease that is regarded as the intestinal form of MCL.

Analysis of K-ras codon 12 mutation in flat and nodular variants of serrated adenoma in the colon.

Purpose: The developmental process of serrated adenomas is obscure, and the importance of genetic alterations has not been elucidated clearly. The possibility that the developmental process and genetic alterations of serrated adenomas could differ from those of ordinary tubular adenomas was explored in this work.

Methods: Serrated adenomas were obtained by endoscopic resection (n = 57) and divided into two groups: flat (n = 10) and nodular (n = 47).

Pit pattern and three-dimensional configuration of isolated crypts from the patients with colorectal neoplasm.

Background: This study examined the usefulness of magnifying videoscopic pit-pattern diagnosis in the differential diagnosis of colonic neoplasms. The relationship between pit patterns and the three-dimensional configuration of the neoplastic gland was evaluated for its contribution toward an understanding of pit patterns.

Methods: A total of 3005 colorectal lesions were examined endoscopically and histopathologically.