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Blood laboratory tests, ultrasonography, an MRI and a CT scan were performed, leading to the diagnosis of a mass in the Morrison\u2019s pouch with ultrasound features of adipose tissue compatible with a liposarcoma, infiltrating the liver and the right kidney. Subsequent CT-guided needle aspiration and a histological examination led to the diagnosis of actinomycosis. The patient was initially treated with a daily dose of 18 million IU of benzylpenicillin for 4 weeks and subsequently prescribed the oral administration of 3\u2009g\/day of amoxicillin for 11 months. A monitoring CT scan was performed after 1, 5, 8 and 12 months, and a CT scan re-evaluation confirmed that the mass had completely healed.<\/jats:p>","DOI":"10.1136\/bcr-2021-243445","type":"journal-article","created":{"date-parts":[[2021,7,23]],"date-time":"2021-07-23T13:33:57Z","timestamp":1627047237000},"page":"e243445","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Abdominal actinomycosis after reparative surgery for cholecystogastric fistula in an immunosuppressed patient"],"prefix":"10.1136","volume":"14","author":[{"given":"Maria Carolina","family":"Fra","sequence":"first","affiliation":[{"name":"Surgery, EOC, Mendrisio, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Massimo","family":"Brenna","sequence":"additional","affiliation":[{"name":"Surgery, EOC, Mendrisio, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Caroline","family":"Di Benedetto","sequence":"additional","affiliation":[{"name":"Infectious Diseases Service, EOC, Mendrisio, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0927-3438","authenticated-orcid":false,"given":"Marco","family":"De Monti","sequence":"additional","affiliation":[{"name":"Surgery, EOC, Mendrisio, Switzerland"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2021,7,23]]},"reference":[{"key":"2025082802083308000_14.7.e243445.1","doi-asserted-by":"crossref","DOI":"10.1136\/bmj.d6099","article-title":"Actinomycosis","volume":"343","author":"Wong","year":"2011","journal-title":"BMJ"},{"key":"2025082802083308000_14.7.e243445.2","first-page":"336","article-title":"Hepatic actinomycosis with infiltration of the diaphragm and right lung: a case report","volume":"12","author":"Islam","year":"2005","journal-title":"Can Respir J"},{"key":"2025082802083308000_14.7.e243445.3","doi-asserted-by":"crossref","DOI":"10.3346\/jkms.1993.8.5.385","article-title":"A case of primary hepatic actinomycosis","volume":"8","author":"Lee","year":"1993","journal-title":"J Korean Med Sci"},{"key":"2025082802083308000_14.7.e243445.4","doi-asserted-by":"crossref","unstructured":"Ferry T , Valour F , Karsenty J . 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