A rapidly growing intraparenchymal schwannoma in a geriatric patient: a case report and literature review

Intraparenchymal schwannomas are extremely rare intracranial tumors. Although their occurrence has been reported in various age groups, they are most frequently seen in individuals under 30 years of age. A 65-year-old woman was brought to the emergency department with impaired consciousness due to spontaneous intracerebral hemorrhage in the right basal ganglia (BG). Approximately 3 months later, the patient was taken to another hospital due to decreased consciousness, and a subsequent brain computed tomography scan showed a mass-like lesion in the right BG. The tumor was removed, and the biopsy result revealed an intraparenchymal schwannoma with no involvement of the ventricular ependymal lining. An immunohistochemical analysis revealed a high Ki-67 labeling index, indicating rapid growth without malignancy.