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15:18
Making MR Imaging Child's Play - Pediatric Neuroimaging Protocol, Guidelines and Procedure
Published on: July 30, 2009
Paediatric PNET: pre-surgical MRI features
A Chawla1, J V Emmanuel, W T Seow
1Department of Neuroradiology, National Neuroscience Institute, Singapore.
Clinical Radiology
|December 6, 2006
Summary
Primitive neuroectodermal tumours (PNETs) show distinct MRI features on FLAIR, DWI, and MRS. Spinal imaging is crucial for detecting cerebrospinal fluid (CSF) dissemination in PNET patients.
Area of Science:
- Neuroradiology
- Oncology
- Neuroscience
Background:
- Primitive neuroectodermal tumours (PNETs) are aggressive central nervous system neoplasms.
- Accurate preoperative characterization is essential for treatment planning.
Purpose of the Study:
- To delineate the preoperative MRI characteristics of PNETs.
- To specifically analyze diffusion-weighted imaging (DWI) and MR spectroscopy (MRS) findings.
- To assess cerebrospinal fluid (CSF) tumour dissemination in PNET patients.
Main Methods:
- Retrospective review of 12 patients with PNETs (9 medulloblastomas, 3 supratentorial PNETs).
- Inclusion of contrast-enhanced intracranial and spinal MRI.
- Utilization of advanced MRI techniques including FLAIR, DWI, and MRS.
Main Results:
- PNETs demonstrated characteristic signal intensities on T1, T2, and FLAIR sequences.
- Diffusion-weighted imaging (DWI) revealed hyperintensity and restricted diffusion.
- MR spectroscopy (MRS) showed elevated choline and decreased N-acetyl aspartate.
- Cerebrospinal fluid (CSF) tumour dissemination was observed in 6 of 12 patients.
Conclusions:
- PNETs exhibit a recognizable imaging signature on FLAIR, DWI, and MRS.
- These MRI features aid in differentiating PNETs from other brain tumours.
- High incidence of CSF dissemination necessitates spinal imaging for comprehensive staging and treatment planning.
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