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- 参考文献 Reference
Ⅰ.はじめに
1966年にBirknerら3)が初めて周囲が石灰化した慢性硬膜下血腫をarmoured brainと名付けて報告した.以来,5例6-9,11)の報告があるが,MRI所見の報告はYamadaら11)の1例のみである.今回,われわれは血腫内容の感染に伴い急速に症状が悪化した石灰化慢性硬膜下血腫の1例を経験したので,そのMRI像の特徴について報告する.
We report a case of calcified chronic subdural hematoma with unusual magnetic resonance imaging (MRI) findings. A 50-year-old male with no marked medical history presented with fever for two weeks. Computed tomography (CT) revealed a thick,calcified subdural hematoma of low-iso mixed density. MRI showed characteristic signals of hematoma in the acute stage. Total removal of the hematoma by craniotomy was performed after rapid deterioration of consciousness. At surgery,a muddy hematoma and a small amount of pus were seen within the calcified capsule. Diagnosis of infected and calcified chronic subdural hematoma was established. His symptoms were resolved completely within the following few months. As the mechanisms of delayed signal sequence of hematoma on MRI,we speculate existence of tissue hypoxia associated with infection and paramagnetic effects of free radicals and ions associated with inflammation,necrosis and calcification.

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