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Aneurysmal Bone Cyst

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Aneurysmal bone cysts usually have a few solid areas composed of spindle cell proliferation. Mitotic activity may be increased in such foci but atypical mitoses are not seen and there is no cytologic atypia. If pleomorphic cells are seen in abundance in the solid areas or in septa separating cavernous blood-filled spaces, one has to exclude telangiectatic osteosarcoma.

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