ABSTRACT
INTRODUCTION Longstanding overt ventriculomegaly in adult (LOVA) is a specific form of noncommunicating hydrocephalus that often causes hydrocephalic dementia. It is a unique category of hydrocephalus firstly presented by the senior author in the middle of 1990s (1-4). Before this new category developed, patients with LOVA might have been considered as a part of normal pressure hydrocephalus (NPH) and were treated by shunts, but treatment of patients with LOVA is extremely difficult in terms of their sensitive compliance of brain parenchyma. LOVA patients definitely develop bilateral subdural hematoma when treated by differential pressure valve (DPV) shunts (1), and that is one of the reasons why LOVA should be categorized and every neurosurgeon has to understand what LOVA is.
