SECTION 1: COMMON SYMPTOMS AND SIGNS: IMAGING APPROACH AND DIFFERENTIAL DIAGNOSIS 4 Imaging Anatomy and Overview 10 Abdominal Pain 16 Nausea and Vomiting 20 Diarrhea 24 Constipation 28 Gastrointestinal (GI) Bleeding 34 Jaundice 40 Abdominal Trauma 44 Abdominal Abscesses and Fistulas 46 Iatrogenic Injury: Feeding Tubes 48 Imaging of Bariatric Surgery 54 Imaging of Pregnant Patients 54 Postoperative and Postprocedure Bowel Imaging SECTION 2: DISORDERS AFFECTING MULTIPLE ORGANS: IMAGING APPROACH INFECTIOUS, INFLAMMATORY, AND DEGENERATIVE 60 HIV/AIDS 64 IgG4-Related Disease 66 Vasculitis 68 Eosinophilic Gastroenteritis and Esophagitis 69 Scleroderma and Related Disorders 70 Cystic Fibrosis TRAUMA AND FOREIGN BODIES 72 Foreign Bodies 76 Barotrauma NEOPLASMS 78 Leukemia and Lymphoma 80 Gastrointestinal Stromal Tumors (GIST) 82 Neuroendocrine Tumors SECTION 3: ABDOMINAL WALL, MESENTERY, AND PERITONEAL CAVITY: IMAGING APPROACH AND DIFFERENTIAL DIAGNOSIS 90 Abdominal Wall, Mesentery, and Peritoneal Cavity: Imaging Approach and Differential Diagnosis Michael P. Federle, MD, FACR INFECTIOUS, INFLAMMATORY, AND DEGENERATIVE 94 Peritonitis 96 Ascites 98 Omental Infarction 99 Inguinal Hernia 100 Femoral Hernia 101 Ventral Hernia 102 Umbilical Hernia 103 Obturator Hernia 104 Spigelian Hernia 105 Lumbar Hernia 106 Paraduodenal Hernia 108 Transmesenteric Hernia 110 Bochdalek Hernia 111 Morgagni Hernia 112 Mesenteritis BENIGN NEOPLASMS AND TUMOR-LIKE CONDITIONS 114 Lymphangioma (Mesenteric Cyst) 116 Desmoid MALIGNANT NEOPLASMS 118 Peritoneal Metastases and Lymphoma 120 Abdominal Mesothelioma 121 Pseudomyxoma Peritonei SECTION 4: ESOPHAGUS: IMAGING APPROACH AND DIFFERENTIAL DIAGNOSIS 124 Esophagus: Imaging Approach and Differential Diagnosis INFECTIOUS, INFLAMMATORY, AND DEGENERATIVE 128 Reflux Esophagitis 129 Barrett Esophagus 130 Caustic Esophagitis 131 Drug-Induced Esophagitis 132 Radiation Esophagitis 133 Esophageal Webs 134 Schatzki Ring 135 Cricopharyngeal Achalasia 136 Achalasia 138 Esophageal Motility Disturbances 140 Zenker Diverticulum 141 Pulsion Diverticulum 142 Traction Diverticulum TRAUMA 143 Esophageal Perforation 144 Boerhaave Syndrome TREATMENT RELATED 146 Esophagectomy: Ivor Lewis and Other Procedures 150 Fundoplication and Other Antireflux Procedures BENIGN NEOPLASMS AND TUMOR-LIKE CONDITIONS 154 Intramural Mesenchymal Esophageal Tumors 155 Fibrovascular Polyp MALIGNANT NEOPLASMS 156 Esophageal Carcinoma 157 Esophageal Metastases and Lymphoma SECTION 5: STOMACH AND DUODENUM: IMAGING APPROACH AND DIFFERENTIAL DIAGNOSIS 160 Stomach and Duodenum: Imaging Approach and Differential Diagnosis Michael P. Federle, MD, FACR EMBRYOLOGY AND ANOMALIES 166 Gastric Diverticulum 167 Duodenal Diverticulum INFECTIOUS, INFLAMMATORY, AND DEGENERATIVE 168 Gastritis and Duodenitis 172 Duodenal Ulcer 173 Gastric Ulcer 174 Zollinger-Ellison Syndrome 175 Ménétrier Disease 176 Gastroparesis 177 Gastric Bezoar 178 Hiatal Hernia 180 Gastric Volvulus TREATMENT RELATED 182 Partial Gastrectomy: Bilroth Procedures BENIGN NEOPLASMS AND TUMOR-LIKE CONDITIONS 184 Gastric Polyps 186 Intramural Mesenchymal Gastric Tumors MALIGNANT NEOPLASMS 188 Gastric Carcinoma 190 Gastric Metastases and Lymphoma SECTION 6: SMALL INTESTINE: IMAGING APPROACH AND DIFFERENTIAL DIAGNOSIS 194 Small Intestine: Imaging Approach and Differential Diagnosis EMBRYOLOGY AND ANOMALIES 198 Malrotation 199 Duplication Cyst 200 Meckel Diverticulum INFECTIOUS, INFLAMMATORY, AND DEGENERATIVE 202 Small Bowel Diverticula 203 Mesenteric Adenitis and Enteritis 204 Opportunistic Intestinal Infections 206 Gallstone Ileus 208 Celiac Sprue Disease 210 Intest sakriti opis