1.
Drawing of anatomy of lower esophagus. Note Inferior (Lower) Esophageal Sphincter and Lower Esophageal Ring (Schatzki's Ring).

2.
This is a barium study that shows the anatomy seen in #1.

3.
This is a barium study that shows a large ulcer typical of CMV esophagitis in a patient with AIDS.

4.
This is a barium study of a classic benign ulcer. Note the radiating folds and the smooth ulcer.

5.
This is a sliding hiatal hernia. Note the portion of the stomach above the diaphragm.

6.
This is a picture of a large ulcerating adenocarcinoma of the stomach. Note the large ulcer in the center of the mass.

7.
This is a barium study of a similar ulcerating adenocarcinoma. Note the irregular collection of barium on the lesser curvature of the stomach. This is barium in the ulcer.

8.
This is the appearance of the normal small intestine with a barium study. Note the size of the bowel and the typical normal mucosal pattern. What is the name of the small bowel folds?

9.
This is the radiographic appearance of the small bowel in a patient with sprue. Note the normal folds and the generalized dilatation of the bowel.

10.
This is a patient with Whipple's Disease. Note the normal caliber of the bowel, but with generalized thickening of the folds.

11.
This is a picture of Crohn's Disease (Regional Enteritis, Terminal Ileitis) of the terminal ileum.

12.
This is the radiographic appearance of Crohn's Disease involving the terminal ileum. Note the grossly thickened and distorted folds.

13.
This is a drawing of the normal colon. You should know the anatomic divisions of the colon.

14.
This is a single contrast (barium only) study of the normal colon.

15.
This is a barium study of the sigmoid colon showing both diverticulosis (small outpouchings) and diverticulitis ( large collection of barium in an abscess).

16.
This is an air-contrast study of the colon showing diverticulosis, a pedunculated adenomatous polyp, and a sessile adenomatous polyp.

17.
This is an air-contrast barium enema showing a villous adenoma. Note the irregular surface of the tumor and the barium in the interstices of the mass.

18.
This is a single contrast barium enema showing a polypoid carcinoma of the cecum.