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Canadian Journal of Infectious Diseases and Medical Microbiology
Volume 24, Issue 2, Pages e45-e46
Case Report

Streptococcus anginosus Pyogenic Liver Abscess following a Screening Colonoscopy

Francis Bonenfant, Étienne Rousseau, and Paul Farand

Internal medicine division, Centre Hospitalier Universitaire de Sherbrooke, Sherbrooke, Québec, Canada

Copyright © 2013 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A previously healthy 58-year-old man presented with a septic thrombosis of the right hepatic vein and a pyogenic liver abscess (PLA) one week after undergoing a screening colonoscopy. Blood cultures and a radiological drainage specimen were both positive for Streptococcus anginosus. Evolution was favourable after six weeks of antibiotherapy. To the authors’ knowledge, the present report is the first to describe a PLA following a screening colonoscopy with no intervention. The authors hypothesize that silent microperforations during colonoscopy contributed to the infection. Although 20% to 40% of reported PLA cases are cryptogenic in the literature, it may be because of failure to recognize and report a precipitating factor such as colonoscopy. As more cases similar to the present case are reported, the number of cryptogenic cases may decrease.