Intestinal histoplasmosis in immunocompetent adults.
OBJECTIVE
To present a retrospective analysis of clinical and endoscopic features of 4 cases of immunocompetent hosts with intestinal histoplasmosis (IH).


METHODS
Four immunocompetent adults were diagnosed with IH between October 2005 and March 2015 at West China Hospital of Sichuan University. Clinical and endoscopic characteristics were summarized and analyzed retrospectively. GMS (Gomori methenamine silver), PAS (periodic acid-Schiff) and Giemsa staining technique were used to confirm Histoplasma capsulatum(H. capsulatum). The symptoms, signs, endoscopic presentations, radiographic imaging, pathological stain results and follow-up are presented as tables and illustrations.


RESULTS
The cases were male patients, ranging from 33 to 61 years old, and primarily presented with non-specific symptoms such as irregular fever, weight loss, abdominal pain and distention. Hepatosplenomegaly and lymphadenopathy were the most common signs. Endoscopic manifestations were localized or diffuse congestion, edema, ulcers, and polypoid nodules with central erosion involving the terminal ileum, ascending colon, transverse colon, descending colon, sigmoid colon and rectum, similar to intestinal tuberculosis, tumor, and inflammatory bowel disease. Numerous yeast-like pathogens testing positive for PAS and GMS stains but negative for Giemsa were detected in the cytoplasm of the histiocytes, which were highly suggestive of H. capsulatum.


CONCLUSIONS
Immunocompetent individuals suffering from histoplasmosis are rarely reported. It is necessary that gastroenterologists and endoscopists consider histoplasmosis as a differential diagnosis, even in immunocompetent patients.
Lin-Lin Zhu, Jin Wang, Zi-Jing Wang, Yi-Ping Wang, Jin-Lin Yang, Department of Gastroenterology, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China.
Lin-Lin
LL
Zhu
Lin-Lin Zhu, Jin Wang, Zi-Jing Wang, Yi-Ping Wang, Jin-Lin Yang, Department of Gastroenterology, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China.
Jin
J
Wang
Lin-Lin Zhu, Jin Wang, Zi-Jing Wang, Yi-Ping Wang, Jin-Lin Yang, Department of Gastroenterology, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China.
Zi-Jing
ZJ
Wang
Lin-Lin Zhu, Jin Wang, Zi-Jing Wang, Yi-Ping Wang, Jin-Lin Yang, Department of Gastroenterology, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China.
Yi-Ping
YP
Wang
Lin-Lin Zhu, Jin Wang, Zi-Jing Wang, Yi-Ping Wang, Jin-Lin Yang, Department of Gastroenterology, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China.
Jin-Lin
JL
Yang
D000328:Adult; D000935:Antifungal Agents / Q000627:therapeutic use; D001431:Bacteriological Techniques; D001706:Biopsy; D002681:China; D003113:Colonoscopy; D003937:Diagnosis, Differential; D006658:Histoplasma / Q000302:isolation & purification*; D006660:Histoplasmosis / Q000175:diagnosis* / Q000188:drug therapy / Q000276:immunology / Q000382:microbiology; D006801:Humans; D007121:Immunocompetence; D007410:Intestinal Diseases / Q000175:diagnosis* / Q000188:drug therapy / Q000276:immunology / Q000382:microbiology; D007422:Intestines / Q000000981:diagnostic imaging / Q000187:drug effects / Q000382:microbiology / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D016896:Treatment Outcome
D000935:Antifungal Agents
Differential diagnosis; Disseminated histoplasmosis; Endoscopic characteristics; Immunocompetence; Intestinal histoplasmosis