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MRI and proton spectroscopy in a child with Rasmussen's encephalitis. Case report
P C Sundgren1, I M Burtscher, J Lundgren
1Department of Diagnostic Radiology, University Hospital Lund, Sweden.
Abstract:
The greater sensitivity of magnetic resonance spectroscopy (MRS) compared with MRI to brain abnormalities in Rasmussen's encephalitis was demonstrated in a 3-year-old boy. The patient, with symptoms, signs and morphological findings consistent with Rasmussen's encephalitis, was followed with MRI and MRS over 30 months. That metabolic changes can be disclosed by MRS before the development of symptoms or signs was demonstrated as pathological spectra were found not only in the diseased left hemisphere but also in the morphologically normal right hemisphere before any neurological disturbance of that side.
Insights
Magnetic resonance spectroscopy (MRS) offers superior sensitivity over MRI for detecting brain abnormalities in Rasmussen's encephalitis. MRS identified metabolic changes in both affected and unaffected brain hemispheres before symptom onset in a pediatric patient.
Area of Science:
- Neuroimaging
- Neurology
- Biochemistry
Background:
- Rasmussen's encephalitis is a rare neurological disorder characterized by progressive inflammation and neuronal loss, primarily affecting one hemisphere of the brain.
- Magnetic resonance imaging (MRI) is a standard tool for assessing structural changes, but its sensitivity to early metabolic alterations in this condition is limited.
- Magnetic resonance spectroscopy (MRS) provides biochemical information about brain tissue composition, potentially offering insights into metabolic disturbances.
Observation:
- A 3-year-old patient with clinical and morphological findings suggestive of Rasmussen's encephalitis was monitored using both MRI and MRS over a 30-month period.
- The study observed the progression of the disease and correlated imaging findings with the patient's neurological status.
- Particular attention was paid to the detection of metabolic abnormalities in brain regions affected by the disease as well as those appearing structurally normal.
Findings:
- Magnetic resonance spectroscopy (MRS) demonstrated significantly greater sensitivity than MRI in detecting brain abnormalities associated with Rasmussen's encephalitis.
- Pathological metabolic spectra were identified by MRS not only in the diseased left hemisphere but also in the morphologically normal right hemisphere.
- These metabolic changes were detectable by MRS prior to the manifestation of clinical symptoms or neurological signs in the affected and contralateral hemispheres.
Implications:
- MRS may serve as an earlier and more sensitive diagnostic tool for Rasmussen's encephalitis compared to conventional MRI.
- The detection of metabolic changes in the morphologically normal hemisphere suggests potential early spread or a more complex pathophysiology than previously understood.
- These findings could lead to earlier therapeutic interventions, potentially altering the disease course and improving patient outcomes.