Published online Apr 21, 2016. doi: 10.3748/wjg.v22.i15.4027
Peer-review started: November 8, 2015
First decision: November 27, 2015
Revised: December 13, 2015
Accepted: January 9, 2016
Article in press: January 11, 2016
Published online: April 21, 2016
Processing time: 147 Days and 8.5 Hours
AIM: 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.
CONCLUSION: 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.
Core tip: Intestinal histoplasmosis (IH) is an uncommon disease. It is more likely to be encountered in immunocompromised patients. No case series of IH in immunocompetent patients has been published so far. This retrospective study included 4 cases of immunocompetent adults with intestinal histoplasmosis and focused on presenting the endoscopic characteristics. It is necessary that gastroenterologists and endoscopists consider histoplasmosis as a differential diagnosis, even in immunocompetent patients.