A cellular and vascular malignant tumor composed of proliferating slightly elongated cells, focally arranged arranged around blood vessels. Foci of necrosis are noted. Anaplasia is marked and mitosis is active. Picture is highly suggestive of embryonal tumor. However marker study is recommended for confirmation and to exclude other possible differential diagnosis of high grade glioma (Synaptophysin, Olig2, IDH-1, GFAP, EMA, S-100, INI1, Ki-67).
Intra-axial space occupying lesion in the area of 4th ventricle, we'll defined with cystic component. It shows post contrast enhancement with focal areas of restricted diffusion and focal dark foci of calcification. It expand 4th ventricle, compress midbrain and cerebellar hemispheres. ??? Ependymoma.
Received multiple piece white-tan soft tissue pieces collectively measured 7.5x5.5x1 cm, the largest measuring 3x2.3x1 cm, totally embedded.