Abstract
As clinical presentation of adult-onset hydrocephalus varies, imaging modalities often provide the first evidence of its presence. Features of increased intraventricular pressure can be subtle, especially early on in the disease course, and knowledge of radiologically relevant anatomy is important. When the presence of hydrocephalus is established, the next step is to determine its aetiology. This includes the assessment of which parts of the CSF spaces are involved, whether there is an obstruction and where it is located, if there are other signs of altered CSF hydrodynamics, or if there are secondary complications related to hydrocephalus. For optimal evaluation of hydrocephalus, a standardised protocol including flow-sensitive and high-resolution imaging should be employed.
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Notes
- 1.
A phenomenon of flow-related signal loss in MRI due to time-of-flight and spin-phase effects. While disliked by some authors, the term “flow-voids” is in widespread clinical use and for the sake of conciseness, we will use the term in this book as well.
- 2.
As opposed to cartesian readout, employed in the standard T2 FSE/TSE sequences.
- 3.
Defined as head circumference above 98th percentile adjusted for sex [27]. For males, this is 53.8 cm and for females 52.9 cm.
Abbreviations
- BRAVO:
-
Brain Volume Imaging
- bSSFP:
-
Balanced steady-state free precession
- CISS:
-
Constructive Interference in the Steady State
- CSF:
-
Cerebrospinal fluid
- CT:
-
Computed tomography
- DESH:
-
Disproportionately Enlarged Subarachnoid space Hydrocephalus
- DWI:
-
Diffusion-weighted imaging
- EDH:
-
Epidural hematoma
- ETL:
-
Echo train length
- FIESTA:
-
Fast Imaging Employing Steady State Acquisition
- FIESTA-C:
-
Fast Imaging Employing Steady State Acquisition-Constructive Interference
- FLAIR:
-
Fluid attenuated inversion recovery
- FSE:
-
Fast spin echo
- iNPH:
-
Idiopathic Normal Pressure Hydrocephalus
- LIAS:
-
Late-onset idiopathic aqueductal stenosis
- LOVA:
-
Long-standing Overt Ventriculomegaly in Adults
- MPR:
-
MultiPlanar Reconstruction
- MPRAGE:
-
Magnetization Prepared RApid Gradient Echo
- MR:
-
Magnetic Resonance
- MRI:
-
Magnetic Resonance Imaging
- PC:
-
Phase Contrast
- PROPELLER:
-
Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction
- ROI:
-
Region of Interest
- SDH:
-
Subdural hematoma
- SNR:
-
Signal to noise ratio
- SPACE:
-
Sampling Perfection with Application optimized Contrasts using different flip angle Evolution
- SSFP:
-
Steady-state free precession
- SWI:
-
Susceptibility weighted imaging
- TE:
-
Echo time
- TSE:
-
Turbo spin echo
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This chapter was supported by the Ministry of Health of the Czech Republic institutional grant no. NU23-04–00551.
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Sedlák, V., Vlasák, A., Skalický, P., Bubeníková, A., Bradáč, O. (2023). Imaging Differential Diagnosis of Adult-Onset Hydrocephalus. In: Bradac, O. (eds) Normal Pressure Hydrocephalus. Springer, Cham. https://doi.org/10.1007/978-3-031-36522-5_17
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