SECTION 1: ESOPHAGUS

Nonneoplastic

Tracheoesophageal Fistula and Esophageal Atresia
Esophageal Duplication Cyst
Inlet Patch
Esophageal Webs and Rings
Esophageal Diverticula
Esophageal Varices
Esophageal Tears and Perforations
Achalasia
Gastroesophageal Reflux Disease
Eosinophilic Esophagitis
Pill-Induced Esophagitis
Corrosive Damage (Lye)
Sloughing Esophagitis
Candidal Esophagitis
HIV-Associated Esophageal Ulcers
Barrett Esophagus

Neoplastic

Dysplasia in Barrett Esophagus
Adenocarcinoma, Esophagus
Squamous Papilloma
Squamous Dysplasia
Squamous Cell Carcinoma, Esophagus
Esophageal Liposarcoma/Giant Fibrovascular Polyp
Granular Cell Tumor

SECTION 2: STOMACH

Nonneoplastic

Pyloric Stenosis
Gastric Antral Vascular Ectasia
Dieulafoy Lesion
Portal Hypertensive Gastropathy
Acute Hemorrhagic Gastritis
Chemical Gastropathy
Gastric Mucosal Calcinosis
Iron Gastropathy
Gastric Ulcers
Carditis
Helicobacter pylori Gastritis
Helicobacter heilmannii Gastritis
Multifocal Atrophic Gastritis
Autoimmune Gastritis
Lymphocytic Gastritis
Eosinophilic Gastroenteritis
Focally Enhanced Gastritis
Collagenous Gastritis
Granulomatous Gastritis
Phlegmonous Gastritis
Herpes Zoster Infection
Gastric Xanthoma
Hyperplastic Polyps, Stomach
Ménétrier Disease
Zollinger-Ellison Syndrome

Neoplastic

Fundic Gland Polyp
Adenoma/Dysplasia, Stomach
Adenocarcinoma, Stomach
Adenocarcinoma, Special Variants
Molecular Classification of Gastric Cancer
Hereditary Diffuse Gastric Cancer
Well-Differentiated Neuroendocrine Tumor (Carcinoid), Stomach
MALT Lymphoma
Gastroblastoma
Plexiform Fibromyxoma

SECTION 3: SMALL INTESTINE

Nonneoplastic

Small Intestine Duplication Cyst
Meckel Diverticulum
Gastric Heterotopia
Ectopic Pancreas
Microvillus Inclusion Disease
Necrotizing Enterocolitis
Primary Lymphangiectasia
Lymphangioma
Peptic Duodenitis/Duodenal Ulcer
Celiac Disease
Tropical Sprue
Bacterial Overgrowth/Stasis
Olmesartan Enteropathy
Autoimmune Enteropathy
Pouchitis
Whipple Disease
Common Variable Immunodeficiency
Giardia
Cryptosporidia
Cystoisospora (Isospora)
Cyclospora
Microsporidia
Yersinia
Mycobacterium avium-intracellulare
Mycobacterium tuberculosis
Strongyloides

Neoplastic

Adenoma, Small Intestine
Adenocarcinoma, Small Intestine
Well-Differentiated Neuroendocrine Tumor (Carcinoid), Small Intestine
Gangliocytic Paraganglioma
Enteropathy-Associated T-Cell Lymphoma
Follicular Lymphoma, Duodenal Type
Gastrointestinal Tract Clear Cell Sarcoma-Like Tumor
Waldenström Protein

SECTION 4: APPENDIX

Nonneoplastic

Acute Appendicitis
Granulomatous Appendicitis
Enterobius vermicularis Appendicitis
Fibrous Obliteration

Neoplastic

Serrated Polyps, Appendix
Appendiceal Mucinous Neoplasms
Well-Differentiated Neuroendocrine Tumor (Carcinoid), Appendix
358 Goblet Cell Adenocarcinoma

SECTION 5: COLON

Nonneoplastic

Hirschsprung Disease
Colonic Duplications, Cysts, and Congenital Diverticula
Motility Disorders
Diverticular Disease
Endometriosis
Preparation Artifacts
Melanosis Coli
Ulcerative Colitis, Colon
Crohn Disease
Lymphocytic Colitis
Collagenous Colitis
Eosinophilic/Allergic Colitis
Diversion Colitis
Diverticular Disease-Associated Colitis
Solitary Rectal Ulcer Syndrome/Mucosal Prolapse
Pneumatosis Cystoides Intestinalis
Sexually Transmitted Proctitis
Acute Infectious Colitis
Focal Active Colitis
Campylobacter
Salmonella
Shigella
Clostridium difficile
Enterohemorrhagic Escherichia coli
Spirochetosis
Adenovirus
Malakoplakia
Histoplasma
Cryptococcus
Entamoeba histolytica
Schistosomiasis

Neoplastic

Benign Fibroblastic Polyp/Perineurioma
Ganglioneuroma
Hyperplastic Polyps, Colon
Sessile Serrated Lesion (Adenoma/Polyp)
Mixed Adenoma-Serrated Polyp
Adenoma, Colon
Adenoma With Pseudoinvasion
Adenoma With Invasive Carcinoma
Colorectal Adenocarcinoma
Familial Cancer Syndromes in Colorectal Carcinoma
Familial Adenomatous Polyposis
Lynch Syndrome (Hereditary Nonpolyposis Colorectal Cancer Syndrome)
Serrated Polyposis
Hereditary Mixed Polyposis Syndrome
Inflammatory Bowel Disease-Associated Neoplasia
Well-Differentiated Neuroendocrine Tumor (Carcinoid), Colon
Mastocytosis

SECTION 6: ANUS

Nonneoplastic

Hemorrhoids
Tailgut Cyst

Neoplastic

Anal Intraepithelial Neoplasia
Squamous Cell Carcinoma, Anus
Basal Cell Carcinoma
Paget Disease
Anal Duct Carcinoma
HPV-Associated Anorectal Adenocarcinomas

SECTION 7: MULTIPLE ORGANS

Nonneoplastic

Amyloidosis
Cytomegalovirus
Herpes Simplex Virus
Nonsteroidal Antiinflammatory Drug (NSAID) Damage
Ischemia
Vasculitis
Behçet Syndrome
Graft-vs.-Host Disease
Mycophenolate Injury
Radiation Effect
Immune Modulator Therapy Effect
Chemotherapy Effect
Taxane Effect
Colchicine Toxicity
Kayexalate Injury
Cowden/PTEN Hamartoma Tumor Syndrome
Hamartomatous Polyps, Cronkhite-Canada
Hamartomatous Polyps, Juvenile
Hamartomatous Polyps, Peutz-Jeghers

Neoplastic

Leiomyoma
Leiomyosarcoma
Gastrointestinal Stromal Tumor
Mesenteric Fibromatosis
Inflammatory Fibroid Polyp
Schwannoma
Inflammatory Myofibroblastic Tumor
Glomus Tumor
Primary Melanoma
Metastatic Melanoma
Large B-Cell Lymphomas
Mantle Cell Lymphoma
Lipomatous Tumors
Follicular Dendritic Cell Sarcoma
Synovial Sarcoma of Gastrointestinal Tract

Joel K. Greenson, MD, Professor of Pathology, Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan and Scott R. Owens, MD, Professor of Pathology, Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan