Presentation
Presented with visual disturbances. Imaging studies revealed a well-demarcated, solid, enhancing mass in the posterior fossa. The patient underwent craniotomy followed by resection of the tumor.
Patient Data
Touch preparation image was captured from the freshly cut tumor surface. It shows true ependymal rosette consisting of tumor cells arranged around well-defined lumens forming gland-like structures.
Higher magnification of one of the true ependymal rosettes showing a collar of cells around a central lumen forming a gland-like structure.
Case Discussion
The final diagnosis was ependymoma.
True ependymal rosettes are more specific for ependymoma but are seen only in about 10% of cases. Ependymomas more frequently show perivascular pseudorosettes which consist of nuclei-free zone around blood vessels.