MICROSCOPIC DESCRIPTION: Celullar proliferation with nidus of small, hiperchromatic nuclei cells, and high mitosis. Some areas of necrosis are identified.
Inmmunohistochemistry shows strong staining in endothelial cells and perinuclear for CD34.
Negative immunostaining for epithelial membrane antigen (EMA). KI 67 is positive.
DIAGNOSIS: Anaplastic Haemangiopericytoma (Solitary Fibrous Tumor/Haemangiopericytoma) WHO Grade III.