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The case underscores the importance of patient education on avoiding aquatic environments, considering atypical mycobacterial infections in differentials for immunocompromised patients with sporotrichoid lesions, and prioritising urgent diagnostic biopsies. Treatment can be lengthy, often requiring up to 12 months, emphasising the need for ongoing patient counselling and multidisciplinary management. Current guidelines recommend a combination of ethambutol and macrolides, though further research is necessary to optimise treatment protocols.<\/jats:p>","DOI":"10.1136\/bcr-2024-262200","type":"journal-article","created":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T00:45:23Z","timestamp":1738802723000},"page":"e262200","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Fish Tank-Associated <i>Mycobacterium Marinum<\/i> Infection in an Immunocompromised Host"],"prefix":"10.1136","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-1999-9562","authenticated-orcid":false,"given":"Attam","family":"Khan","sequence":"first","affiliation":[{"name":"Dermatology Department, Shrewsbury and Telford Hospital NHS Trust, Shrewsbury, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dimple","family":"Jain","sequence":"additional","affiliation":[{"name":"Dermatology Department, Shrewsbury and Telford Hospital NHS Trust, Shrewsbury, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2025,2,5]]},"reference":[{"key":"2025082708244134000_18.2.e262200.1","doi-asserted-by":"publisher","DOI":"10.1080\/01652176.2018.1447171"},{"key":"2025082708244134000_18.2.e262200.2","doi-asserted-by":"publisher","DOI":"10.1086\/429998"},{"key":"2025082708244134000_18.2.e262200.3","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccm.2014.11.002"},{"key":"2025082708244134000_18.2.e262200.4","doi-asserted-by":"publisher","DOI":"10.1080\/00365540902774599"},{"key":"2025082708244134000_18.2.e262200.5","first-page":"957","article-title":"Septic arthritis due to Mycobacterium marinum","volume":"21","author":"Harth","year":"1994","journal-title":"J Rheumatol"},{"key":"2025082708244134000_18.2.e262200.6","doi-asserted-by":"publisher","DOI":"10.1001\/archinte.162.15.1746"},{"key":"2025082708244134000_18.2.e262200.7","doi-asserted-by":"crossref","DOI":"10.1155\/2021\/8820720","article-title":"Fish Tank Granuloma Presenting as a Nasal Cavity Mass","volume":"2021","author":"Sekine","year":"2021","journal-title":"Case Reports Immunol"},{"key":"2025082708244134000_18.2.e262200.8","doi-asserted-by":"publisher","DOI":"10.1016\/0738-081X(95)00023-9"},{"key":"2025082708244134000_18.2.e262200.9","doi-asserted-by":"crossref","first-page":"568","DOI":"10.1016\/j.gastrohep.2017.10.002","article-title":"Acute infection due to Mycobacterium marinum in a patient with ulcerative colitis and metabolic syndrome on infliximab therapy","volume":"41","author":"de la Piscina","year":"2018","journal-title":"Gastroenterol Hepatol (Engl Ed)"},{"key":"2025082708244134000_18.2.e262200.10","doi-asserted-by":"publisher","DOI":"10.1016\/j.diagmicrobio.2005.06.006"},{"key":"2025082708244134000_18.2.e262200.11","doi-asserted-by":"publisher","DOI":"10.1164\/rccm.200604-571ST"},{"key":"2025082708244134000_18.2.e262200.12","doi-asserted-by":"crossref","DOI":"10.1093\/ofid\/ofac077","article-title":"Treatment and Outcome of Culture-Confirmed Mycobacterium marinum Disease","volume":"9","author":"Hendrikx","year":"2022","journal-title":"Open Forum Infect Dis"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2024-262200","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T15:24:46Z","timestamp":1756308286000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2024-262200"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,2]]},"references-count":12,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2025,2,5]]},"published-print":{"date-parts":[[2025,2]]}},"alternative-id":["10.1136\/bcr-2024-262200"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2024-262200","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2025,2]]}}}