{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T00:05:47Z","timestamp":1756339547095,"version":"3.44.0"},"reference-count":25,"publisher":"BMJ","issue":"8","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Case Rep"],"accepted":{"date-parts":[[2023,7,18]]},"published-print":{"date-parts":[[2023,8]]},"abstract":"<jats:p>Malignant psoas syndrome is a rare and under-recognised entity with a life expectancy of months. Its presentation is characterised by refractory back pain, which is a red flag that should raise suspicion about the condition. We present a case of a man who presented with refractory back pain and bilateral hydronephrosis without hydroureter who had no evident initial obstruction and showed stent-placement failure. Three months later, a recurrence of colorectal cancer associated with malignant psoas syndrome was diagnosed. We review the current literature on malignant psoas syndrome and hydronephrosis in relation to the presentation of cancer.<\/jats:p>","DOI":"10.1136\/bcr-2023-254886","type":"journal-article","created":{"date-parts":[[2023,8,9]],"date-time":"2023-08-09T13:15:41Z","timestamp":1691586941000},"page":"e254886","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":2,"title":["Malignant psoas syndrome and bilateral hydronephrosis without evident obstruction in colorectal cancer"],"prefix":"10.1136","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0781-4256","authenticated-orcid":false,"given":"Neus","family":"Rabaneda-Lombarte","sequence":"first","affiliation":[{"name":"Neurosciences, Hospital Universitari Germans Trias i Pujol, Badalona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Eugeniu","family":"Grama","sequence":"additional","affiliation":[{"name":"Cardiology, Hospital Universitari Germans Trias i Pujol, Badalona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Niccolo","family":"Viveros","sequence":"additional","affiliation":[{"name":"Rheumatology, Hospital Universitari Germans Trias i Pujol, Badalona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xoel","family":"Pena-P\u00e9rez","sequence":"additional","affiliation":[{"name":"Internal Medicine, Hospital Universitari Germans Trias i Pujol, Badalona, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2023,8,9]]},"reference":[{"key":"2025082709561112000_16.8.e254886.1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1440-1673.1990.tb02831.x"},{"key":"2025082709561112000_16.8.e254886.2","first-page":"82","article-title":"Malignant Psoas syndrome associated with gynecological malignancy: three case reports and a review of the literature","volume":"9","author":"Takamatsu","year":"2018","journal-title":"Mol Clin Oncol"},{"key":"2025082709561112000_16.8.e254886.3","doi-asserted-by":"crossref","first-page":"109","DOI":"10.4081\/monaldi.2019.1012","article-title":"\u201cNon-small cell lung cancer presenting as \u201cPsoas muscle syndrome\u201d: a case report\u201d","volume":"89","author":"Mollica","year":"2019","journal-title":"Monaldi Arch Chest Dis"},{"key":"2025082709561112000_16.8.e254886.4","article-title":"Advanced bladder cancer with malignant Psoas syndrome: a case report with a focus on physical findings and complications","volume":"26","author":"Tsuchiyama","year":"2019","journal-title":"Urol Case Rep"},{"key":"2025082709561112000_16.8.e254886.5","doi-asserted-by":"crossref","first-page":"231","DOI":"10.11604\/pamj.2020.36.231.21137","article-title":"Ovarian adenocarcinoma metastasis mimicking Psoas abscess on imaging: a case report","volume":"36","author":"Kharbach","year":"2020","journal-title":"Pan Afr Med J"},{"key":"2025082709561112000_16.8.e254886.6","doi-asserted-by":"crossref","first-page":"348","DOI":"10.4103\/IJPC.IJPC_205_19","article-title":"Impact of radiation therapy on pain relief of cancer patients affected by on malignant Psoas syndrome: 26 years of experience","volume":"26","author":"Gerontopoulos","year":"2020","journal-title":"Indian J Palliat Care"},{"key":"2025082709561112000_16.8.e254886.7","doi-asserted-by":"crossref","DOI":"10.1136\/bmj.f7095","article-title":"Red flags to screen for malignancy and fracture in patients with low back pain: systematic review","volume":"347","author":"Downie","year":"2013","journal-title":"BMJ"},{"key":"2025082709561112000_16.8.e254886.8","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(18)30480-X"},{"key":"2025082709561112000_16.8.e254886.9","doi-asserted-by":"crossref","unstructured":"Choudhury SR . Hydronephrosis. Pediatric Surgery 2018:289\u201396. doi:10.1007\/978-981-10-6304-6","DOI":"10.1007\/978-981-10-6304-6_47"},{"key":"2025082709561112000_16.8.e254886.10","doi-asserted-by":"crossref","first-page":"1","DOI":"10.12968\/hmed.2019.0274","article-title":"An overview of hydronephrosis in adults","volume":"81","author":"Patel","year":"2020","journal-title":"Br J Hosp Med"},{"key":"2025082709561112000_16.8.e254886.11","doi-asserted-by":"crossref","first-page":"599","DOI":"10.1097\/00007632-198707000-00019","article-title":"Low-back pain caused by hydronephrosis in a solitary kidney. spine (Phila PA 1976)","volume":"12","author":"Ray","year":"1987","journal-title":"Spine"},{"key":"2025082709561112000_16.8.e254886.12","doi-asserted-by":"crossref","first-page":"172","DOI":"10.2214\/ajr.98.1.172","article-title":"Nonobstructive hydronephrosis and hydroureter","volume":"98","author":"Shopfner","year":"1966","journal-title":"Am J Roentgenol Radium Ther Nucl Med"},{"key":"2025082709561112000_16.8.e254886.13","doi-asserted-by":"crossref","first-page":"88","DOI":"10.3339\/jkspn.2016.20.2.88","article-title":"Nonobstructive bilateral hydronephrosis & hydroureter from nephrogenic diabetes insipidus with a novel mutation of AQP2 gene (p.A123G)","volume":"20","author":"Song","year":"2016","journal-title":"Child Kidney Dis"},{"key":"2025082709561112000_16.8.e254886.14","doi-asserted-by":"crossref","DOI":"10.1186\/1752-1947-6-376","article-title":"Nonobstructive hydronephrosis due to social polydipsia: a case report","volume":"6","author":"Maroz","year":"2012","journal-title":"J Med Case Rep"},{"key":"2025082709561112000_16.8.e254886.15","doi-asserted-by":"crossref","first-page":"482","DOI":"10.1053\/ejso.2001.1143","article-title":"Hydronephrosis associated with colorectal carcinoma: treatment and outcome","volume":"27","author":"Lev-Chelouche","year":"2001","journal-title":"Eur J Surg Oncol"},{"key":"2025082709561112000_16.8.e254886.16","first-page":"496","article-title":"The clinical correlation of an autopsy study of recurrent colorectal cancer","volume":"189","author":"Welch","year":"1979","journal-title":"Ann Surg"},{"key":"2025082709561112000_16.8.e254886.17","doi-asserted-by":"crossref","first-page":"18","DOI":"10.1016\/S0002-9610(05)80639-7","article-title":"Surgery for recurrent rectal adenocarcinoma in the presence of hydronephrosis","volume":"164","author":"Rodriguez-Bigas","year":"1992","journal-title":"Am J Surg"},{"key":"2025082709561112000_16.8.e254886.18","doi-asserted-by":"publisher","DOI":"10.1007\/s10350-004-6725-8"},{"key":"2025082709561112000_16.8.e254886.19","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1053\/crad.2002.1123","article-title":"CT detection of hydronephrosis in resected colorectal cancer: a predictor of recurrent disease","volume":"58","author":"Brown","year":"2003","journal-title":"Clin Radiol"},{"key":"2025082709561112000_16.8.e254886.20","doi-asserted-by":"publisher","DOI":"10.1038\/s41571-020-0392-0"},{"key":"2025082709561112000_16.8.e254886.21","doi-asserted-by":"crossref","first-page":"266","DOI":"10.1055\/a-0831-2522","article-title":"Endoscopic surveillance after surgical or endoscopic resection for colorectal cancer: European society of gastrointestinal Endoscopy (ESGE) and European society of digestive oncology (ESDO) guideline","volume":"51","author":"Hassan","year":"2019","journal-title":"Endoscopy"},{"key":"2025082709561112000_16.8.e254886.22","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1186\/s12894-018-0346-3","article-title":"Gastrointestinal cancer and bilateral hydronephrosis resulted in a high risk of ureteral stent failure","volume":"18","author":"Ohtaka","year":"2018","journal-title":"BMC Urol"},{"key":"2025082709561112000_16.8.e254886.23","doi-asserted-by":"crossref","first-page":"211","DOI":"10.1089\/jpm.2009.0193","article-title":"The malignant Psoas syndrome revisited: case report, mechanisms, and current therapeutic options","volume":"13","author":"Stevens","year":"2010","journal-title":"J Palliat Med"},{"key":"2025082709561112000_16.8.e254886.24","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1186\/1470-7330-14-21","article-title":"Muscle metastases: comparison of features in different primary tumours","volume":"14","author":"Surov","year":"2014","journal-title":"Cancer Imaging"},{"key":"2025082709561112000_16.8.e254886.25","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1080\/15360288.2017.1301617","article-title":"Pain management of malignant Psoas syndrome under epidural analgesia during palliative radiotherapy","volume":"31","author":"Ota","year":"2017","journal-title":"J Pain Palliat Care Pharmacother"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2023-254886","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,27]],"date-time":"2025-08-27T16:56:21Z","timestamp":1756313781000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2023-254886"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,8]]},"references-count":25,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2023,8,9]]},"published-print":{"date-parts":[[2023,8]]}},"alternative-id":["10.1136\/bcr-2023-254886"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2023-254886","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2023,8]]}}}