Diagnostic performance of black tent sign on 3D T2 SPACE in the diagnosis of idiopathic normal-pressure hydrocephalus.

Purpose: Idiopathic normal-pressure hydrocephalus (iNPH) presents with Hakim's triad and diagnosis is solely based on clinical findings. The role of imaging is confined to the detection of ventriculomegaly and the exclusion of other possible entities. Hyperdynamic CSF flow has been demonstrated in various flow-related imaging studies.