... spaces over the convexities and parasagittal areas: the subarachnoid space block pattern 44 -- Bilateral ... ... spaces and lateral ventricles 45 -- Apparent partial or complete spinal subarachnoid space blocks 46 ... ... and/or intraventricular space disease 47 -- Accelerated clearance of the radionuclide from subarachnoid ... ... spaces. 47 -- 17 Shunt Evaluation in Hydrocephalus -- Obstructive noncommunicating hydrocephalus: -- ... ... -- Noncommunicating hydrocephalus -- Evaluation of cerebrospinal fluid shunts -- Distorted ventricles ...