LAUSR

RATIONALE Giant meningioma stemming from the intraventricular zone has been reported to be extremely few. Two cases of supersize (>8 cm) intraventricular meningiomas presenting with cystic lesions and their clinical characteristics were collected in our study. PATIENT CONCERNS One patient was a 56-year-old man who was hospitalized for blunt headache and weakness of the right lower limb along with a defect of the right visual field for 12 months. The other patient is a 22-year-old lady who presented with a slight headache accompanied by right facial numbness for 1 week. None of them had a significant past medical history. DIAGNOSES Computed tomography and magnetic resonance imaging of both patients revealed a giant heterogeneous, enhancing tumor mainly in the left trigonum with low-density or hypointense cystic lesions located within or around the tumor. The pathological and immunohistochemical staining indicated fibroblastic meningioma (case 1) and atypical meningioma (case 2) respectively, thus the patients' diagnoses were confirmed. INTERVENTIONS Total microsurgical resection, including the cystic wall, was performed via a transcortical (transtemporoparietal occipital) approach in both patients, and a ventricular drainage tube was placed for 24 to 48 hours routinely after removed the tumor. OUTCOMES Postoperatively, both patients recovered free from episodes of symptoms, and imaging examinations confirmed no evidence of regrowth of the meningioma during an average 24 months follow-up. LESSONS Cystic lesions may indicate the histopathologic malignancy of intraventricular meningioma. Transcortical approach through the posterior temporal lobe or the parieto-occipital lobe is an effective technology for giant intraventricular meningiomas.