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Approximately 20% of colorectal cancer cases present with metastatic disease on initial evaluation. The most common locations for metastasis are the liver, lung, peritoneum, bone, and extra-regional lymph nodes. Metastatic disease to the skeletal muscle, however, is considerably rare. We present a clinical case of a 52-year-old female found to have a cystic iliopsoas muscle metastasis from rectosigmoid adenocarcinoma, initially classified as an infected fluid collection.<\/jats:p>","DOI":"10.1177\/23247096211024067","type":"journal-article","created":{"date-parts":[[2021,6,11]],"date-time":"2021-06-11T03:13:02Z","timestamp":1623381182000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":4,"title":["Solitary Cystic Psoas Muscle Metastasis From Rectosigmoid Adenocarcinoma"],"prefix":"10.1177","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7543-1823","authenticated-orcid":false,"given":"Kristen","family":"Farraj","sequence":"first","affiliation":[{"name":"Nassau University Medical Center, East Meadow, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaehyuck","family":"Im","sequence":"additional","affiliation":[{"name":"Nassau University Medical Center, East Meadow, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis F.","family":"Gonzalez","sequence":"additional","affiliation":[{"name":"Nassau University Medical Center, East Meadow, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew","family":"Lu","sequence":"additional","affiliation":[{"name":"Nassau University Medical Center, East Meadow, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"suffix":"III","given":"Reid","family":"Portnoy","sequence":"additional","affiliation":[{"name":"Nassau University Medical Center, East Meadow, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alida","family":"Podrumar","sequence":"additional","affiliation":[{"name":"Nassau University Medical Center, East Meadow, NY, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2021,6,11]]},"reference":[{"key":"bibr1-23247096211024067","doi-asserted-by":"publisher","DOI":"10.1159\/000323926"},{"key":"bibr2-23247096211024067","first-page":"1147","volume":"75","author":"Kumar PP","year":"1983","journal-title":"J Natl Med Assoc"},{"key":"bibr3-23247096211024067","doi-asserted-by":"publisher","DOI":"10.3399\/bjgp11X572427"},{"key":"bibr4-23247096211024067","doi-asserted-by":"publisher","DOI":"10.4172\/2161-069X.S12-002"},{"key":"bibr5-23247096211024067","doi-asserted-by":"publisher","DOI":"10.1007\/s005950070013"},{"key":"bibr6-23247096211024067","doi-asserted-by":"publisher","DOI":"10.1007\/s13691-018-0333-2"},{"key":"bibr7-23247096211024067","first-page":"986453","volume":"2014","author":"Gharaibeh KA","year":"2014","journal-title":"Case Rep Gastrointest Med"},{"key":"bibr8-23247096211024067","first-page":"76","volume":"11","author":"Azadeh P","year":"2016","journal-title":"Iran J Pathol"},{"key":"bibr9-23247096211024067","first-page":"2294","volume":"38","author":"Takada J","year":"2011","journal-title":"Gan To Kagaku Ryoho"},{"key":"bibr10-23247096211024067","doi-asserted-by":"publisher","DOI":"10.1148\/radiology.160.3.3737906"},{"key":"bibr11-23247096211024067","doi-asserted-by":"publisher","DOI":"10.1007\/BF01753809"},{"key":"bibr12-23247096211024067","doi-asserted-by":"publisher","DOI":"10.4103\/ijnm.IJNM_167_16"},{"key":"bibr13-23247096211024067","doi-asserted-by":"publisher","DOI":"10.1007\/s002560050606"}],"container-title":["Journal of Investigative Medicine High Impact Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/23247096211024067","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/23247096211024067","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/23247096211024067","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T08:01:16Z","timestamp":1777449676000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/23247096211024067"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,1]]},"references-count":13,"alternative-id":["10.1177\/23247096211024067"],"URL":"https:\/\/doi.org\/10.1177\/23247096211024067","relation":{},"ISSN":["2324-7096","2324-7096"],"issn-type":[{"value":"2324-7096","type":"print"},{"value":"2324-7096","type":"electronic"}],"subject":[],"published":{"date-parts":[[2021,1]]},"article-number":"23247096211024067"}}