Assessment of optic nerve sheath enlargement and Frisen classification in idiopathic intracranial hypertension: Implications for estimating intracranial pressure and grading chronic papilledema

评估视神经鞘增厚和Frisen分级在特发性颅内高压中的作用：对估计颅内压和慢性视乳头水肿分级的意义