Introduction The purpose of this review is to describe the magnetic resonance imaging (MRI) findings in patients with noncommunicating hydrocephalus (NCH). Methods We describe the technical aspects of MR sequences that are of use for the imaging of cerebrospinal fluid (CSF). Both the diagnosis of NCH and the follow-up after endoscopic third ventriculostomy (ETV) are discussed through clinical cases. Results NCH is related to an obstacle hindering the CSF pathways. The combined use of anatomical and flow-sensitive MR sequences may help to characterize hydrocephalus. An imaging protocol is described at 1.5-T. Conclusions The first step of the diagnostic work-up consists of the detection of an obstacle hindering CSF flow pathways using both constructive interference in steady state and flow-sensitive MR sequences. CSF volumetry and quantification of ventricular wall movement may also improve the diagnosis and follow-up of patients with NCH.