This may be due to ventricular obstruction (e.g., secondary to neoplasms) or to impaired CSF resorption at the arachnoid villi, usually as a consequence of prior inflammation.

• 可能的原因也许是因为脑室的阻滞(例如脑瘤)，或是脑蜘蛛膜绒毛缺损造成脑脊液再吸收不良。