脳腫瘍に類似した非腫瘍性疾患の3例

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Differentiation of brain tumors from other disease is usually possible from clinica al nd radiologica flindings. However, it sometimes becomes difficult because of atypical clinical course and radiological features that simulate brain tumors. We report three cases with lesions mimicking brain tumors out of 95 stereotactic biopsy cases. The first case was right thalamic infarction with progressing left hemiparesis. Magnetic resonance (MR)imaging showed a mass lesion with heterogeneous enhancement in the right thalamus simulating malignant glioma. The histologica slpecimen showed coagulative necrosis due to infarction. The second case was Balo's concentric sclerosis whose onset was generalized convulsion. MR imaging showed a ring-enhancing lesion in the left parietal lobe. A histologica dliagnosis of diffuse astrocytoma was made. Several days after the biopsy, the patient developed left visual disturbance and MR imaging showed contralateral new lesions. Reviewed histologica dliagnosis was a demyelinatin dgisease. The third case was myelinoclasti dciffuse sclerosis. MR imaging showed a diffuse lesion extending from corpus callosum to the bilateral frontal lobes with a left temporal small lesion. As a clinical diagnosis of a demyelinating disease was made, administration of high dose corticosteroid asnd plasma exchange were carried out. However t, he response was poor and multiple enhancing new lesions appeared on MR imaging S. tereotactic biopsie ws ere carried out twice and the histologica dliagnosis was a demyelinating disease. To avoid unnecessary invasive procedures, we should be aware of these cases mimicking brain tumor.
近畿脳腫瘍病理検討会の論文

脳腫瘍に類似した非腫瘍性疾患の3例

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