Localized Pigmented Villonodular Synovitis of the Hip: Sudden-Onset Pain Caused by Torsion of the Tumor Pedicle
(a) The excised tumor had a pedicle (white arrows), and (b) the cut sections revealed tumor necrosis except in the margins. (c) A histological image shows a nodular and papillary structure and the presence of synovial cells, histiocytes, and hyperplasia (original magnification ×1.25; hematoxylin and eosin staining). (d) Histopathological findings: enucleated mononuclear stromal cells (white arrows) and multinuclear giant cells (black arrow), with hemosiderin in the cytoplasm (black arrowhead) (original magnification ×100; hematoxylin and eosin staining).
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