Figure 3.

Light microscopy. A Characteristic picture of the tumour showing spindle cells with surrounding hyalinized collagen bundles, and haemangiopericytoma-like vascular space (*). B Higher magnification of spindle cell area with intermixed collagen. C Higher magnification of cellular area with little collagen and increased amount of mitoses (arrow). D, E, and F Immunohistochemical staining for CD34, BCL-2, and CD99, respectively.