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We report a rare case of amebiasis associated with an intraabdominal abscess without colitis, an intestinal perforation, or other extraintestinal amebiasis. A patient was admitted with cirrhosis and a history of spontaneous bacterial peritonitis (SBP) and was found to have a high C-reactive protein (CRP) level. Dynamic CT and ultrasound echo findings showed an intraabdominal abscess. No intestinal lesions or extraintestinal lesions other than the intraabdominal abscess were observed. Blood cultures and puncture fluid cultures were negative for bacteria. However, microscopic examination of the puncture fluid showed a cystic form of amoeba, leading to a diagnosis of an amoeba abscess. The abscess disappeared after 10 days of oral treatment with metronidazole. When an abdominal abscess is seen in an immunocompromised patient such as a cirrhotic patient, amoeba infection should be considered as a possible diagnosis.

Citation

Soichi Iritani, Yusuke Kawamura, Daiki Yamashige, Nozomu Muraishi, Akira Kajiwara, Shunichiro Fujiyama, Hitomi Sezaki, Tetsuya Hosaka, Norio Akuta, Masahiro Kobayashi, Mariko Kobayashi, Satoshi Saitoh, Fumitaka Suzuki, Yasuji Arase, Kenji Ikeda, Yoshiyuki Suzuki, Hiromitsu Kumada. An encapsulated bulky abdominal abscess due to amoeba. Clinical journal of gastroenterology. 2021 Apr;14(2):555-559

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PMID: 33428067

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