Question 1194
{"accessible":true,"alternatives":[{"id":5983,"text":"beam hardening "},{"id":5984,"text":"CT detector failure"},{"id":5985,"text":"hyperparathyroidism"},{"id":5986,"text":"multiple myeloma"},{"id":5987,"text":"Paget disease of bone"}],"archived":false,"correctAlternativeId":5987,"explanation":"\u003cp\u003eExtensive loss of bone density (lysis) involving\u0026nbsp;the right parietal and bilateral occipital bones without bone expansion or soft-tissue mass. The appearance is characteristic of the lytic phase of\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/paget-disease-bone?lang=gb\"\u003ePaget's disease\u003c/a\u003e\u0026nbsp;and is often referred to as\u0026nbsp;\u003ca href=\"https://radiopaedia.org/articles/osteoporosis-circumscripta-cranii?lang=gb\"\u003eosteoporosis circumscripta\u003c/a\u003e.\u0026nbsp;\u003c/p\u003e","id":1194,"imageUrl":"https://prod-images-static.radiopaedia.org/images/41277839/4b91145e682c96fe498a7cf5fa2997_big_gallery.jpeg","imageAttribution":{"kind":"case","rID":62022},"imageAttributionCaseInfo":{"title":"Osteoporosis circumscripta","contributor_name":"Andrew Dixon","contributor_param":"dixona","case_rid":62022,"case_param":"osteoporosis-circumscripta-3"},"firstQuestionPath":"/questions/2495","nextQuestionPath":"/articles/hyperparathyroidism/questions/932","relatedArticles":[{"id":21561,"title":"Salt and pepper sign (skull)","link":"/articles/salt-and-pepper-sign-skull-1?lang=us"},{"id":9555,"title":"Multiple myeloma","link":"/articles/multiple-myeloma-1?lang=us"},{"id":24972,"title":"Raindrop skull","link":"/articles/raindrop-skull?lang=us"},{"id":1988,"title":"Ring artifact","link":"/articles/ring-artifact-2?lang=us"},{"id":48590,"title":"Beam hardening","link":"/articles/beam-hardening?lang=us"},{"id":1824,"title":"Paget disease (bone)","link":"/articles/paget-disease-bone?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eAxial\u0026nbsp;CT image of the head in an 80 year old male. What is the most likely cause for this\u0026nbsp;skull appearance?\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/1194"}],"attemptsPercentages":[{"alternativeId":"5987","percentage":44},{"alternativeId":"5985","percentage":15},{"alternativeId":"5986","percentage":9},{"alternativeId":"5984","percentage":10},{"alternativeId":"5983","percentage":22}],"promptToLogin":false,"questionManager":false,"articleId":"hyperparathyroidism"}