Gastrointestinal imaging in HIV.

Gastrointestinal opportunistic disorders are common in HIV-infection and are often the index AIDS-defining opportunistic illness. Almost 80% of HIV-infected patients experience gastrointestinal (GI) symptoms at some point during the course of their illness, and the incidence of GI disorders increases as immunodeficiency worsens. Endoscopy is the preferred invasive procedure for diagnosing most GI diseases in these patients because mucosal biopsy is often necessary to establish a specific diagnosis.