Sections show fragments composed of proliferating fibroblastic stromal cells with plump nuclei admixed with evenly distributed osteoclast-type multinucleated giant cells. Foci of numerous blood vessels with associated interstitial hemorrhage are present. No cytologic atypia or malignant features are identified.
Rt. patellar tumor, by MRI suspected giant cell tumor or bone cyst.
Bloody soft tissue fragments collectively measured 4.5x4x0.8 cm, totally embedded.
Rt. patellar tumor, biopsy:
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