Question 833
{"accessible":false,"alternatives":[{"id":4214,"text":"calcium oxalate +/- calcium phosphate"},{"id":4215,"text":"cystine"},{"id":4216,"text":"pure calcium phosphate"},{"id":4217,"text":"struvite (triple phosphate)"},{"id":4218,"text":"uric acid"}],"archived":false,"correctAlternativeId":4214,"explanation":"\u003cp\u003eThe composition of urinary tract stones varies widely depending upon metabolic alterations, geography and presence of infection, and their size varies from gravel to staghorn calculi. The more common composition of stones:\u003c/p\u003e\u003cul\u003e\n\u003cli\u003ecalcium oxalate +/- calcium phosphate: ~75%\u003c/li\u003e\n\u003cli\u003estruvite (triple phosphate): 15%\u003c/li\u003e\n\u003cli\u003epure calcium phosphate: 5-7%\u003c/li\u003e\n\u003cli\u003euric acid: 5-8%\u003c/li\u003e\n\u003cli\u003ecystine: 1%\u003c/li\u003e\n\u003c/ul\u003e","id":833,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2641","nextQuestionPath":"/articles/urolithiasis/questions/832","relatedArticles":[{"id":49825,"title":"Renal tract calculi (summary)","link":"/articles/renal-tract-calculi-summary?lang=us"}],"alsoUsedIn":[{"id":178,"kind":"Course","title":"Cases in Radiology: Abdomen - page 178","link":"https://radiopaedia.org/courses/cases-in-radiology-abdomen/pages/178"},{"id":166,"kind":"Course","title":"Abdominal Emergency Radiology Course - page 166","link":"https://radiopaedia.org/courses/abdominal-emergency-radiology-course-online/pages/166"}],"stem":"\u003cp\u003eWhat is the most common composition of renal calculi?\u0026nbsp;\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/833"}],"attemptsPercentages":[{"alternativeId":"4214","percentage":92},{"alternativeId":"4217","percentage":2},{"alternativeId":"4215","percentage":1},{"alternativeId":"4216","percentage":2},{"alternativeId":"4218","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"urolithiasis"}