**2. Incidence**

Twet [6] listed out the common duodenal disorders as inflammatory bowel disease, lymphangiectasia, ulcer, foreign body, *Giardia*, parasites (Strongyloides, *Ascaris*), bacterial overgrowth, and neoplasia.


**Figure 1.** *Duodenoscopy: proximal duodenum—Ancylostoma caninum.*
