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Unusual case of huge rectal ameboma mimicking a rectal carcinoma in a taiwanese traveler


1 Department of Surgery, National Defense Medical Center, Tri-Service General Hospital, Taipei City, Taiwan
2 Department of Pathology, National Defense Medical Center, Tri-Service General Hospital, Taipei City, Taiwan
3 Department of Surgery, Division of Colorectal Surgery, National Defense Medical Center, Tri-Service General Hospital, Taipei City, Taiwan
4 Department of Surgery, Division of Colorectal Surgery; Department of Surgery, Division of Colon and Rectal Surgery, National Defense Medical Center, Tri-Service General Hospital, Songshan Branch, Taipei City, Taiwan
5 Department of Surgery, Division of Colorectal Surgery, National Defense Medical Center, Tri-Service General Hospital; National Defense Medical Center, Graduate Institute of Medical Sciences; National Defense Medical Center, School of Medicine, Taipei City, Taiwan

Correspondence Address:
Je-Ming Hu,
Department of Surgery, Division of Colorectal Surgery, National Defense Medical Center, Tri-Service General Hospital, No. 325, Section 2, Cheng-Kung Road, Neihu District, Taipei City 11490
Taiwan
Shu-Wen Jao,
Department of Surgery, Division of General Surgery, Tri-Service General Hospital, NO. 325, Section 2, Cheng-Kung Road, Taipei 114
Taiwan
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jmedsci.jmedsci_111_20

Invasive protozoan infection with ameboma formation is relatively rare in advanced-modern countries and can be mistakenly diagnosed as a neoplasm, which constitutes the majority of conditions in medical centers. The treatment between rectal ameboma and carcinoma is different, in which the former can be treated by effective medication, and the latter may sustain invasively inconvertible surgical intervention. Herein, we present a case of a 66-year-old man with a travel history to Japan who presented with anal pain and diarrhea secondary to ulcerative rectal mass detected by colonoscopy, which resembled colorectal carcinoma. The mass lesion was later determined histopathologically to be amebic infection caused by invasive Entamoeba histolytica, which had remarkable regression after metronidazole therapy. This case highlights the necessity of complete recognition of ulcerative rectal mass before definitive treatment and inadvertent clues from travel history to achieve a good outcome.


 

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