A elderly case of late-onset aqueductal membranous occlusion was denied idiopathic normal pressure hydrocephalus by tap test

Abstract

A 71-year-old male complained gait disturbance from six months ago. He was suspected idiopathic normal pressure hydrocephalus (iNPH), and a tap test was performed, but his symptoms did not improve, so he was judged that surgical treatment was not indicated. He visited our hospital, magnetic resonance imagings were performed again and he was diagnosed as late-onset aqueductal membranous occlusion.

He underwent third ventriculostomy and improved his symptoms postoperatively. It is necessary to be fully aware that even elderly people with suspected iNPH may have hydrocephalus other than iNPH.