Malignant Meningioma of the Lateral Ventricle
This 65-year-old man presented with a very rare malignant meningioma in the trigonum of the right lateral ventricle. Neurological examination showed bilateral papilledema. Magnetic resonance imaging revealed a solid, enhancing tumor in the right trigonum with a hypointense cystic component located in the center of the tumor. The lesion was totally resected via a superior parietooccipital transcortical approach. Histological examination showed an anaplastic (malignant) meningioma with architectural disarray, high mitotic activity (20/10 hpf), necrosis, and cytological atypism. As in our case, heterogeneous signal, due to necrotic tissue and frequently demonstrated on both T1- and T2- weighted sequences, is suggestive of an aggressive type of meningioma.
Meningiomas are common intracranial tumors comprising 10 to 15% of the all brain neoplasms, the vast majority of which are benign. Intraventricular meningiomas are rare tumors, comprising only 0.5 to 5% of all intracranial meningiomas. To our knowledge, only a few cases of malignant anaplastic meningioma of the lateral ventricle have been reported. In this report, we describe a patient with an anaplastic (malignant) meningioma of the lateral ventricle and summarize the radiological and histological features of this case.
This 65-year-old man presented with a very rare malignant meningioma in the trigonum of the right lateral ventricle. Neurological examination showed bilateral papilledema. Magnetic resonance imaging revealed a solid, enhancing tumor in the right trigonum with a hypointense cystic component located in the center of the tumor. The lesion was totally resected via a superior parietooccipital transcortical approach. Histological examination showed an anaplastic (malignant) meningioma with architectural disarray, high mitotic activity (20/10 hpf), necrosis, and cytological atypism. As in our case, heterogeneous signal, due to necrotic tissue and frequently demonstrated on both T1- and T2- weighted sequences, is suggestive of an aggressive type of meningioma.
Meningiomas are common intracranial tumors comprising 10 to 15% of the all brain neoplasms, the vast majority of which are benign. Intraventricular meningiomas are rare tumors, comprising only 0.5 to 5% of all intracranial meningiomas. To our knowledge, only a few cases of malignant anaplastic meningioma of the lateral ventricle have been reported. In this report, we describe a patient with an anaplastic (malignant) meningioma of the lateral ventricle and summarize the radiological and histological features of this case.
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