Gastric Epithelial Polyps and Tumors ADENOMA/DYSPLASIA/INTRAEPITHELIAL NEOPLASIA Definitions and Terminology Gastric epithelial neoplastic lesions, which do not fit the criteria for an adenocarcinoma, have traditionally been referred to as adenomas…
The Anal Canal ANATOMIC AND HISTOLOGIC CHARACTERISTICS Terminology Used for the Anus, Distal Rectum, and Perianal Skin and Problems with These Terms There are numerous terms applied to the anal…
Small and Large Bowel Structure: Developmental and Mechanical Disorders STRUCTURE OF THE SMALL AND LARGE INTESTINES External Appearance Small intestine. The adult small intestine ranges from 300 to 900 cm…
Small Bowel Mucosal Disease SMALL BOWEL MUCOSAL DISEASE A diverse array of disorders can be diagnosed with small bowel biopsy. However, in our experience, the evaluation of nonneoplastic small bowel…
Inflammatory Disorders of the Esophagus: Reflux and Nonreflux Types GASTROESOPHAGEAL REFLUX DISEASE (REFLUX ESOPHAGITIS-GERD/GORD) Definition of GERD Gastroesophageal reflux disease (GERD) is defined as at least weekly heartburn, acid regurgitation,…
Mesenchymal Tumors INTRODUCTION Mesenchymal tumors of the gastrointestinal (GI) tract can be classified as shown in Table 7-1. Some are unique to the GI tract (e.g., gastrointestinal stromal tumor [GIST],…
Polyps and Tumors of the Esophagus Most tumors of the esophagus that cause symptoms are malignant. Of these, over 95% are either squamous cell carcinoma or adenocarcinoma. Squamous cell carcinoma…
Stomach: Normal Structures and Developmental Abnormalities EMBRYOLOGY Stomach The stomach appears at 14 weeks as a fusiform dilation of the caudal part of the foregut. The dorsal border grows faster…
Motility Disorders DIVERTICULAR DISEASE OF THE SMALL AND LARGE INTESTINES Definition Intestinal diverticula are outpouchings, herniations, or protrusions (all tend to be sued as synonyms) of mucosa and submucosa through…
