RT Book, Section A1 Zhu, Zhenglun A2 Greenberger, Norton J. A2 Blumberg, Richard S. A2 Burakoff, Robert SR Print(0) ID 1119986477 T1 Gastrointestinal Manifestations of Immunodeficiency T2 CURRENT Diagnosis & Treatment: Gastroenterology, Hepatology, & Endoscopy, 3e YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9780071837729 LK accessmedicine.mhmedical.com/content.aspx?aid=1119986477 RD 2024/04/19 AB ESSENTIAL CONCEPTSRecurrent infections and diarrhea are the most common gastrointestinal manifestations of immunodeficiency.Some pathogens (eg, Mycobacterium avium complex) are unique to immunocompromised hosts; others (eg, Cryptosporidium, Giardia lamblia) cause self-limited diarrhea in healthy hosts but chronic diarrhea in immunosuppressed patients.In patients without a specific diagnosis after routine study, endoscopic evaluation with biopsy is important in establishing the diagnosis.Candida species, herpes simplex virus (HSV), cytomegalovirus (CMV), and Mycobacterium species are the most frequent causative agents of infectious esophagitis in an immunocompromised host.In immunocompromised patients, opportunistic infections are a major cause of abdominal pain and can evolve rapidly.The frequency of intestinal lymphomas is increased in patient with common variable immunodeficiency (Chua et al 2008).