Whats the normal size of brain ventricles in adults my left ventricle is measuring 16mm is that normal or not?

See Neurologist: Normal sizes of the ventricles on CT and MRI shows them to be less than less than 7 mm in adults under 60 years of age and less than 9 mm in adults above 60 years. Ventriculomegaly shows enlarged ventricles/ normal spinal fluid (CSF) pressure. Hydrocephalus shows enlarged ventricles/increased spinal fluid pressure. It can occur when an injury or illness alters the circulation of CSF.