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CASE REPORTS
JOURNAL ARTICLE
Coexistent arteriovenous malformation and hippocampal sclerosis.
Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia 2016 June
Cavernous angiomas or cavernomas have been occasionally described in patients presenting with medically intractable epilepsy. Reports of cavernomas associated with a second pathology potentially causative of seizures have rarely been documented; most commonly, the second pathology is focal cortical dysplasia or less frequently, hippocampal sclerosis. To our knowledge, cases of arteriovenous malformation arising in this clinical setting and associated with hippocampal sclerosis have not been previously described. We report a 56-year-old woman who initially presented at age 24years with staring spells. Imaging studies revealed an arteriovenous malformation in the right parietal lobe. At age 51years, she represented with signs and symptoms related to a hemorrhage from the malformation. The patient underwent Gamma Knife radiosurgery (Elekta AB, Stockholm, Sweden) of the lesion. She subsequently developed seizures, refractory to medical management. MRI studies showed atrophy in the right hippocampus. She underwent resection of the right parietal lobe and hippocampus. Histopathologic examination of the right parietal lesion revealed an arteriovenous malformation marked by focally prominent vascular sclerosis, calcification and adjacent hemosiderin deposition. The hippocampus was marked by prominent neuronal loss and gliosis in the CA1 region, consistent with CA1 sclerosis or hippocampal sclerosis International League Against Epilepsy type 2.
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