PART 1 Esophagus Inflammatory Disorders 1.1 Eosinophilic Versus Reflux Esophagitis 1.2 Lymphocytic Esophagitis Versus Candida Esophagitis Versus Lichen Planus Esophagitis 1.3 Candida Esophagitis Versus Other Neutrophil-Predominant Esophagitis 1.4 Viral Esophagitis Versus Pill and Corrosive Esophagitis 1.5 Epidermoid Metaplasia Versus Glycogenic Acanthosis 1.6 Melanosis or Melanocytosis ("Brown" Esophagus) Versus Acute Necrosis ("Black" Esophagus) Glandular Dysplasia and Carcinoma 1.7 Columnar-Lined Esophagus Versus Barrett''s Esophagus 1.
8 Multilayered Epithelium Versus Barrett''s Esophagus 1.9 Ancillary Stains for the Diagnosis of Barrett''s Esophagus 1.10 Barrett''s Esophagus Versus Carditis With Intestinal Metaplasia 1.11 Reactive Changes Versus Dysplasia (Including "Crypt Dysplasia") in Barrett''s Esophagus 1.12 Low-Grade Versus High-Grade Conventional Dysplasia 1.13 Conventional Versus Foveolar Dysplasia 1.14 p53 Immunohistochemistry for Diagnosis of Dysplasia in Barrett''s Esophagus 1.15 High-Grade Dysplasia Versus Intramucosal Adenocarcinoma 1.
16 Early Adenocarcinoma Reporting in Endoscopic Mucosal Resection and Endoscopic Submucosal Dissection Specimens 1.17 Adenocarcinoma Variants Squamous Dysplasia and Carcinoma 1.18 Grading and Management of Squamous Dysplasia 1.19 Typical and Variant Squamous Cell Carcinoma Uncommon and Rare Esophageal Tumors and Therapy-Related Changes 1.20 Giant Fibrovascular Polyp Versus Atypical Lipomatous Tumor 1.21 Leiomyoma Versus Granular Cell Tumor 1.22 Poorly Differentiated and Undifferentiated Carcinomas 1.23 Diagnostic Challenges in Postneoadjuvant Esophageal Cancer Resection Specimens 1.
24 Esophageal Adenocarcinoma Versus Salivary Gland-Type Tumors 1.25 Primary Versus Secondary Esophageal Carcinomas Part 2: Stomach Benign Conditions 2.1 Normal Stomach Versus Chronic Gastritis 2.2 Chronic Gastritis Versus Reactive Gastropathy 2.3 Helicobacter Pylori Gastritis: To Stain or Not to Stain 2.4 Autoimmune Gastritis Versus Helicobacter Gastritis 2.5 Iron Pill Gastropathy Versus Other Gastric Siderosis 2.6 Doxycycline Injury Versus Nonspecific Erosion 2.
7 Lanthanum Injury Versus Other Histiocytic Infiltration 2.8 Lymphocytic Versus Collagenous Gastritis 2.9 Gastric Biopsy With Increase in Eosinophils 2.10 Acute Gastritis With Ulcer Versus Cytomegalovirus Gastritis 2.11 Acute Gastritis With Ulcer Versus Adenovirus Gastritis 2.12 Phlegmonous Gastritis 2.13 Chronic Gastritis With Intestinal Metaplasia: To Type or Not to Type 2.14 Chronic Gastritis With Reactive Changes Versus Intestinal-Type Dysplasia 2.
15 Chronic Gastritis With Reactive Changes Versus Foveolar Dysplasia 2.16 High-Grade Dysplasia Versus Intramucosal Adenocarcinoma Polyps 2.17 Hyperplastic Polyp Versus Fundic Gland Polyp 2.18 Hyperplastic Polyp With Dysplasia Versus Intestinal-Type Adenoma 2.19 Pyloric Gland Adenoma Versus Foveolar-Type Adenoma 2.20 Oxyntic Gland Adenoma Versus Other Adenomas 2.21 Hyperplastic Polyp Versus Peutz-Jeghers Polyp 2.22 Multiple Fundic Polyps Versus Gastric Adenocarcinoma and Proximal Polyposis of the Stomach Malignant Epithelial Tumors 2.
23 Gastric Adenocarcinoma: Intestinal Versus Diffuse Type 2.24 Lymphocyte-Rich/Epstein-Barr Virus-Positive Versus Mismatch Repair Deficient Adenocarcinoma 2.25 Hepatoid Carcinoma Versus Poorly-Differentiated Adenocarcinoma 2.26 Enteroblastic Adenocarcinoma Versus Conventional Adenocarc 2.27 Signet Ring Cell Carcinoma Versus Pseudo Signet Ring Cells, 2.28 Signet Ring Cell Carcinoma: Sporadic Versus Familial, 2.29 Signet Ring Cell Carcinoma: Primary Versus Metastatic, 2.30 Sarcomatoid Carcinoma Versus Sarcoma, 2.
31 Gastroblastoma Versus Adenocarcinoma, 2.32 Gastric Adenocarcinoma With HER2 Staining, 2.33 Gastric Adenocarcinoma With Programmed Cell Death Ligand 1 Staining, 2.34 Well-Differentiated Neuroendocrine Tumor in Autoimmune Gastritis (Type 1) Versus Neuroendocrine Hyperplasia, 2.35 Well-Differentiated Neuroendocrine Tumor: Sporadic (Type 3) Versus Other Types (Types 1 and 2) and Neuroendocrine Carcinoma, Part 3: Small Intestine Benign Conditions 3.1 Gastric Heterotopia Versus Neoplasm 3.2 Pediatric Small Intestinal Biopsies in Intractable Diarrhea 3.3 Small Bowel Disorders: Celiac Disease and Mimics 3.
4 Small Bowel Infection: Protozoal, Microsporidial, Viral 3.5 Macrophage Infiltrates: Infectious Versus Non-Infectious Etiologies 3.6 Heterotopic Pancreas Versus Neoplasm 3.7 Active Ileitis With Crystals Versus Crohn''s Disease Polyps 3.8 Adenoma With High-Grade Dysplasia Versus Invasive Adenocarcinoma 3.9 Pyloric Gland Adenoma Versus Brunner Gland Hamartoma Tumors 3.10 Dystrophic Fat Versus Adenocarcinoma 3.11 Well-Differentiated Neuroendocrine Tumor Versus Neuroendocrine Carcinoma 3.
12 Multilocular Peritoneal Inclusion Cyst Versus Malignant Mesothelioma 3.13 Gangliocytic Paraganglioma Versus Well-Differentiated Neuroendocrine Tumor of the Small Intestine 3.14 Ampullary Adenocarcinoma (pT2 Vs pT3) 3.15 Small Intestinal Adenocarcinoma Versus Metastatic Adenocarcinoma Part 4: Appendix Benign Conditions 4.1 Acute Appendicitis With Diverticulitis Versus Low-Grade Appendiceal Mucinous Neoplasm 4.2 Sessile Serrated Adenoma Versus Mucosal Hyperplasia 4.3 Benign Subserosal Glands (Endosalpingiosis) Versus Adenocarcinoma Malignant Tumors 4.4 Low-Grade Appendiceal Mucinous Neoplasm Versus Appendiceal Adenoma 4.
5 Low-Grade Appendiceal Mucinous Neoplasm Versus Distended Appendix With Mucin 4.6 Low-Grade Appendiceal Mucinous Neoplasm With Serosal Acellular Mucin and Other Risk Factors in Low-Grade Appendiceal Mucinous Neoplasm 4.7 Low-Grade Appendiceal Mucinous Neoplasm Versus High-Grade Appendiceal Mucinous Neoplasm 4.8 Mucinous Carcinoma Peritonei (Pseudomyxoma Peritonei), Low Grade (Grade 1) Versus High Grade (Grade 2) 4.9 Mucinous Carcinoma Peritonei (Pseudomyxoma Peritonei), Grade 2 Versus Grade 3 4.10 Goblet Cell Adenocarcinoma Versus Neuroendocrine Neoplasms and Conventional Adenocarcinoma 4.11 Appendiceal Neuroendocrine Tumor: Low- Versus High-Risk Features 4.12 Tubular Neuroendocrine Tumor Versus Adenocarcinoma Part 5: Colon Inflammatory Disorders 5.
1 Infectious Colitis Versus Inflammatory Bowel Disease 5.2 Ischemic Versus Pseudomembranous Colitis 5.3 Graft-Versus-Host Disease Versus Bowel Prep Effect 5.4 Eosinophilic Colitis Versus Infiltrative Disorders With Prominent Eosinophils 5.5 Enterocolic Lymphocytic Phlebitis Versus Inflammatory Bowel Disease 5.6 Lymphocytic Versus Collagenous Colitis 5.7 Diverticular Disease-Associated Colitis Versus Inflammatory Bowel Disease 5.8 Diversion Colitis Versus Inflammatory Bowel Disease 5.
9 Isolated Asymptomatic Chronic Colitis and Ileitis Versus Inflammatory Bowel Disease 5.10 Drug-Induced Colitis Versus Inflammatory Bowel Disease 5.11 Radiation Colitis Versus Inflammatory Bowel Disease 5.12 Solitary Rectal Ulcer Syndrome Versus Inflammatory Bowel Disease 5.13 Ulcerative Colitis Versus Crohn''s Disease 5.14 Fulminant Versus Infectious Colitis 5.15 Crohn Disease Versus Sarcoidosis 5.16 Pouchitis Versus Crohn''s Disease 5.
17 Isolated and Multiple Ulcers: Crohn''s Disease Versus Drug Versus Other Etiologies 5.18 Reactive Versus Dysplasia in Inflammatory Bowel Disease 5.19 Conventional Low- Versus High-Grade Dysplasia in Inflammatory Bowel Disease 5.20 Conventional Versus Dysplasia Variants in Inflammatory Bowel Disease: Hypermucinous, Serrated Dysplasia, Serrated Epithelial Change, and Gastric 5.21 Microscopic Colitis and Inflammatory Bowel Disease Overlap 5.22 Crystals 5.23 Chronic Intestinal Pseudo-obstruction Versus Hirschsprung Disease Colon Polyps and Polyposis Syndromes 5.24 Serrated Polyps Versus Adenomas 5.
25 Tubular Adenoma With Squamoid Morules Versus Composite Adenoma-Microcarcinoid 5.26 Tubular Adenoma Versus Endometriosis and Mucosal Colonization by Cancer 5.27 Adenoma With Misplaced Epithelium ("Pseudoinvasion") Versus Adenocarcinoma 5.28 Endoscopic Mucosal Resection and Endoscopic Submucosal Dissection Reporting of Adenocarcinoma in Polyp 5.29 Familial Adenomatous Polyposis Versus Other Adenomatous Polyposis Syndromes 5.30 Serrated Polyposis Syndrome Versus Multiple Hyperplastic Polyps 5.31 Mucosal Prolapse Versus Peutz-Jeghers Polyp 5.32 Juvenile Polyps Versus Inflammatory Polyps 5.
33 Cowden Syndrome Versus Cronkhite-Canada Syndrome 5.34 Tailgut Cyst Versus Other Retrorectal Cysts Colon Carcinomas: Diagnosis and Staging 5.35 Adenocarcinoma Not Otherwise Specified Versus Special Types 5.36 Well- Versus Moderately Versus Poorly Differentiated Adenocarcinoma 5.37 pT3 Versus pT4a Colorectal Cancer 5.38 Lymphovascular Invasion in Colorectal Carcinoma 5.39 Tumor Deposits Versus Nodal Metastasis Versus Venous Invasion 5.40 Poorly Differentiated Neuroendocrine Carcinomas Versus Well-Differentiated Neuroendocrine Tumors Versus Mixed Neuroendocrine-Nonneuroendocrine Neoplasm 5.
41 Primary Versus Metastatic Carcinoma 5.42 Isolated Tumor Cells Versus Micrometastasis Versus Positive Lymph Nodes 5.43 Positive Versus Negative Radial Margins