Fig. 2

BCOR HG-ESS from breast needle core biopsy. A H&E section of breast needle core biopsy with metastatic BCOR HG-ESS at 40X magnification, showing moderately cellular spindle cell lesion with no normal mammary parenchyma. B H&E section of breast needle core biopsy with metastatic BCOR HG-ESS at 200X magnification, showing a mitotically active, spindle-cell lesion arranged in short fascicles within a predominantly fibrous stroma. C CD10 immunohistochemistry at 200X magnification. Note cells with strong/diffuse expression admixed with those with negative expression. D Cyclin D1 immunohistochemistry showing strong/diffuse expression at 100X magnification