Question 2045
{"accessible":false,"alternatives":[{"id":10160,"text":"distension of the superior ophthalmic vein"},{"id":10161,"text":"flattening of the posterior surface of the sclera"},{"id":10162,"text":"increased vertical tortuosity of the optic nerve"},{"id":10163,"text":"narrowing of the optic nerve sheath"}],"archived":false,"correctAlternativeId":10163,"explanation":"\u003cp\u003eIn patients with spontaneous intracranial hypotension, leakage of CSF results in narrowing of the optic nerve sheath as a result of the diminished volume of CSF in the subarachnoid space around the optic nerve.\u003c/p\u003e\u003cp\u003eAlthough the intracranial dural venous sinuses are distended in spontaneous intracranial hypotension (SIH), distension of the superior ophthalmic vein does not occur because they are outside of the cranial cavity; blood is being \"sucked\" into the cranium due to reduced CSF pressure.\u003c/p\u003e\u003cp\u003eFlattening of the posterior sclera and increased vertical tortuosity of the optic nerve are both features of idiopathic intracranial hypertension (IIH) not SIH.\u003c/p\u003e","id":2045,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2045","nextQuestionPath":null,"relatedArticles":[{"id":8648,"title":"Idiopathic intracranial hypertension","link":"/articles/idiopathic-intracranial-hypertension-1?lang=us"},{"id":1519,"title":"Spontaneous intracranial hypotension","link":"/articles/spontaneous-intracranial-hypotension-2?lang=us"},{"id":58887,"title":"Optic nerve sheath diameter","link":"/articles/optic-nerve-sheath-diameter?lang=us"}],"alsoUsedIn":[{"id":987,"kind":"Course","title":"2021 Virtual Conference Private Use - 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