I have untreated obstructive hydrocephalus. neuro reluctant to refer to surgery. does a progression in biventricular diameter of the lateral ventricles but no change in third ventricle over time mean the pressure is not that significantly increased?

The brain generates more spinal fluid every hour & if there is uncompensated hydrocephalus the ventricles expand & tissue pressure creates symptoms. Any neurosurgical procedure to treat the issue must balance the inherent risk of surgery/complications of any inserted device, need for ongoing care with the possible benefit. It sounds like there is a reluctance to intervene bases on all factors