Supratentorial ependymomas: computed tomographic and pathologic correlations.

Of a total of 52 cases of ependymomas, 38 were intracranial, with 15 being supratentorial and 23 infratentorial. Pre- and postoperative computed tomographic scans were correlated with surgical pathologic findings in four cases of supratentorial ependymomas. Pathologic specimens were analyzed from another four cases for which only postoperative scans were available. Seven cases had no computed tomographic studies, but pathology reports were available. Common computed tomography findings for these tumors included para- or intraventricular location, one or more cystic areas within the tumor, and calcifications within the lesion or around its periphery. Proven subependymal spread of tumor was evident by computed tomography in one case. Mixing of ependymoma with oligodendroglioma was present in four cases and with both oligodendroglioma and astrocytoma in two cases. Microscopic calcifications were more frequently seen in ependymomas that were mixed with oligodendroglioma.