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MR imaging of minamata disease: qualitative and quantitative analysis
Y Korogi1, M Takahashi, M Sumi
1Department of Radiology, Kumamoto University School of Medicine, Japan.
Abstract:
Minamata disease (MD), a result of methylmercury poisoning, is a neurological illness caused by ingestion of contaminated seafood. We evaluated MR findings of patients with MD qualitatively and quantitatively. Magnetic resonance imaging at 1.5 Tesla was performed in seven patients with MD and in eight control subjects. All of our patients showed typical neurological findings like sensory disturbance, constriction of the visual fields, and ataxia. In the quantitative image analysis, inferior and middle parts of the cerebellar vermis and cerebellar hemispheres were significantly atrophic in comparison with the normal controls. There were no significant differences in measurements of the basis pontis, middle cerebellar peduncles, corpus callosum, or cerebral hemispheres between MD and the normal controls. The calcarine sulci and central sulci were significantly dilated, reflecting atrophy of the visual cortex and postcentral cortex, respectively. The lesions located in the calcarine area, cerebellum, and postcentral gyri were related to three characteristic manifestations of this disease, constriction of the visual fields, ataxia, and sensory disturbance, respectively. MR imaging has proved to be useful in evaluating the CNS abnormalities of methylmercury poisoning.
Insights
Minamata disease, a neurological disorder from methylmercury poisoning, shows specific brain atrophy in MRI scans. This imaging helps identify central nervous system damage linked to the disease's symptoms.
Area of Science:
- Neurology
- Radiology
- Toxicology
Background:
- Minamata disease (MD) is a severe neurological disorder caused by methylmercury poisoning through contaminated seafood.
- Key symptoms include sensory disturbance, visual field constriction, and ataxia.
Purpose of the Study:
- To evaluate Magnetic Resonance (MR) imaging findings in patients with Minamata disease.
- To quantitatively and qualitatively assess central nervous system (CNS) abnormalities in MD patients.
Main Methods:
- MR imaging was performed on seven MD patients and eight healthy controls using a 1.5 Tesla scanner.
- Quantitative image analysis focused on specific brain regions, including the cerebellum, cerebral hemispheres, and brainstem.
Main Results:
- Significant atrophy was observed in the cerebellar vermis and hemispheres of MD patients compared to controls.
- Dilated calcarine and central sulci indicated atrophy in the visual and postcentral cortex, respectively.
- No significant differences were found in the basis pontis, middle cerebellar peduncles, corpus callosum, or cerebral hemispheres.
Conclusions:
- MR imaging is effective in detecting CNS abnormalities associated with methylmercury poisoning.
- Specific brain regions like the cerebellum and visual cortex show atrophy correlating with MD symptoms.
- Quantitative MRI analysis provides valuable insights into the neurological damage caused by Minamata disease.