MRI abnormalities in neurofibromatosis type 1 (NF1): a study of men and mice

Hyperintense lesions on T2-weighted MR images of the brain, predominantly located in the basal ganglia, the brainstem and cerebellum, are a frequent finding in patients with neurofibromatosis type 1. Nature and significance of these lesions are still unknown so that the term ‘unidentified bright obj...

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Bibliographic Details
Published in:Brain & development (Tokyo. 1979) 1999-06, Vol.21 (4), p.268-273
Main Authors: Rosenbaum, Thorsten, Engelbrecht, Volkher, Krölls, Wilfried, van Dorsten, Ferdinand A., Hoehn-Berlage, Mathias, Lenard, Hans-Gerd
Format: Article
Language:English
Subjects:
Adolescent
Animals
Biological and medical sciences
Brain Neoplasms - diagnosis
Child
Child, Preschool
Developmental Disabilities - diagnosis
Female
Gene Deletion
Genes, Neurofibromatosis 1 - genetics
Glioma - diagnosis
Humans
Infant
Infant, Newborn
Intellectual impairment
Magnetic Resonance Imaging
Male
Medical sciences
Mice
Mice, Inbred C57BL
Mice, Knockout
Neurofibromatosis 1 - diagnosis
Neurofibromatosis 1 - genetics
Neurofibromatosis type 1
Neurology
Nf1 knockout mice
Optic Nerve Neoplasms - diagnosis
Optic pathway gliomas
Seizures - diagnosis
Tumors of the nervous system. Phacomatoses
Unidentified bright objects
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Summary:Hyperintense lesions on T2-weighted MR images of the brain, predominantly located in the basal ganglia, the brainstem and cerebellum, are a frequent finding in patients with neurofibromatosis type 1. Nature and significance of these lesions are still unknown so that the term ‘unidentified bright objects’ (UBOs) has been introduced to allow an unbiased description. We analyzed brain MRI scans of 31 children with definite diagnosis of neurofibromatosis type 1 according to the NIH criteria. High-intensity lesions on T2-weighted images were present in 86% of the patients. They did not correlate to other MRI findings such as optic pathway gliomas and were not indicative of intellectual impairment. Additionally, brain MR imaging of Nf1 knockout mice was performed to find out if similar abnormalities are present in this animal model. A total of 9 Nf1 knockout mice was examined on a dedicated animal MRI scanner at 4.7 Tesla but no evidence of high-signal intensity lesions on T2-weighted images was found. Therefore, the Nf1 mouse model seems to be unhelpful in providing further insights into the histological basis of hyperintense MRI abnormalities in NF1 patients.
ISSN:0387-7604
1872-7131
DOI:10.1016/S0387-7604(99)00024-8