Question 832
{"accessible":false,"alternatives":[{"id":4209,"text":"calcium phosphate"},{"id":4210,"text":"calcium oxalate"},{"id":4211,"text":"cystine"},{"id":4212,"text":"struvite"},{"id":4213,"text":"uric acid"}],"archived":false,"correctAlternativeId":4212,"explanation":"\u003cp\u003eStaghorn calculi are composed of struvite (MAP, magnesium ammonium phosphate) which accounts for approximately 70% of these calculi, and is usually mixed with calcium phosphate thus rendering them opaque on both plain films and CT.\u003c/p\u003e","id":832,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2641","nextQuestionPath":null,"relatedArticles":[{"id":49825,"title":"Renal tract calculi (summary)","link":"/articles/renal-tract-calculi-summary?lang=us"},{"id":9910,"title":"Staghorn calculus (kidney)","link":"/articles/staghorn-calculus-kidney?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\u003eIn most cases, what is the main constituent of 'staghorn'\u0026nbsp;renal calculi?\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/832"}],"attemptsPercentages":[{"alternativeId":"4210","percentage":24},{"alternativeId":"4209","percentage":16},{"alternativeId":"4212","percentage":52},{"alternativeId":"4211","percentage":4},{"alternativeId":"4213","percentage":4}],"promptToLogin":false,"questionManager":false,"articleId":"urolithiasis"}