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Cranial MRI in ataxia-telangiectasia
F Sardanelli1, R C Parodi, C Ottonello
1Department of Radiology, University of Genoa, Italy.
Abstract:
We examined five males with laboratory-confirmed ataxia-telangiectasia (AT), aged 9-28 years, several times by MRI (9 examinations: 5 at 0.15 T, 3 at 0.5 T, 1 at 1.5 T). Intermediate, T1-, T2- and T2*-weighted spin-echo and gradient-echo sequences were performed. All patients showed vermian atrophy, enlarged fourth ventricle and cisterna magna; four showed cerebellar hemisphere atrophy; two enlarged infracerebellar subarachnoid spaces and four patients had sinusitis. No focal areas of abnormal signal were seen in the brain, diffuse high signal was found in the central cerebral white matter of the oldest patient. AT is an important human model of inherited cancer susceptibility and multisystem ageing; as in xeroderma pigmentosum and other "breakage syndromes", ionising radiation should be avoided. When imaging is necessary, MRI should be preferred to CT in patients known or suspected to have AT and those with undefined paediatric ataxias of nontraumatic origin. If atrophy of only the cerebellum, especially the vermis, is noted, laboratory research should be performed to confirm the diagnosis of AT.
Insights
Magnetic resonance imaging (MRI) reveals cerebellar atrophy in patients with ataxia-telangiectasia (AT), a rare genetic disorder. Early detection through MRI findings like vermian atrophy can prompt further laboratory research for AT diagnosis.
Area of Science:
- Neurology
- Radiology
- Genetics
Background:
- Ataxia-telangiectasia (AT) is a rare inherited disorder affecting multiple systems.
- Patients with AT exhibit increased susceptibility to ionizing radiation.
- Understanding AT's neurological manifestations is crucial for diagnosis and management.
Purpose of the Study:
- To characterize the neuroimaging findings in male patients with laboratory-confirmed ataxia-telangiectasia (AT).
- To evaluate the utility of MRI in diagnosing AT and differentiating it from other pediatric ataxias.
- To provide recommendations for imaging protocols in suspected AT cases.
Main Methods:
- MRI examinations were conducted on five male patients aged 9-28 years with confirmed AT.
- Multiple MRI sequences (T1-, T2-, T2*-weighted, spin-echo, gradient-echo) were performed at varying magnetic field strengths (0.15 T, 0.5 T, 1.5 T).
- Neuroimaging findings were systematically analyzed and correlated with clinical presentation.
Main Results:
- Consistent findings included vermian atrophy, enlarged fourth ventricle, and cisterna magna.
- Cerebellar hemisphere atrophy was observed in four patients.
- Sinusitis was present in four patients; diffuse high signal in the central white matter was noted in the oldest patient.
Conclusions:
- MRI can reveal characteristic cerebellar atrophy patterns suggestive of AT.
- MRI is preferred over CT for imaging patients with suspected AT due to radiation sensitivity.
- Cerebellar atrophy, particularly of the vermis, warrants further laboratory investigation for AT diagnosis.