Pathological images of the lesion (a) gliosarcoma. A biphasic tissue pattern with areas displaying gliomatous and mesenchymal differentiation (H&E stain, original magnification ). (b) The gliomatous component shows strong GFAP expression and is separated from mesenchymal tumour cells without GFAP expression (immunoperoxidase stain, original magnification ). (c) Dense reticulin network shows that the sarcomatous area is well demarcated from the glial tumour portion (reticulin stain, original magnification ). (d) Sarcomatous area consisting of spindled and pleomorphic cells arranged in a storiform pattern (H&E stain, original magnification ).
