Solitary fibrous tumour (haemangiopericytoma) (histology)
Diagnosis almost certain
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Slides of a solitary fibrous tumour/haemangiopericytoma demonstrating a highly cellular tumour with sparse background reticulum and numerous branching thin walled vessels and frequent mitoses. AreasAreas of necrosis are visible (figure 4). This is consistent with a grade III haemangiopericytoma pattern tumour.
Ideally, the diagnosis would be confirmed with STAT6 immunohistochemistyimmunohistochemistry, as well as CD34 and vimentin.