CASE 158 History: A 57-year-old male alcoholic presents with a 6-month history of retrosternal dysphagia and 10-kg weight loss. 1. What should be included in the differential diagnosis of the imaging finding shown in the figure? (Choose all that apply.) C. Downhill esophageal varices 2. What part of the bowel wall present in other segments of the GI tract is not found in the esophagus? 3. Why do “jump” metastases occur in esophageal carcinoma? A. Portosystemic venous collaterals B. Network of lymphatic channels C. Absence of esophageal serosa