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Histologic features of aneurysmal bone cyst. (A) Irregular cystic spaces with multi-nucleated giant cells are present. (B) Multiple irregular cystic spaces, some filled with blood, and a variable number of giant cells in the cyst wall. (C) Blood-filled cystic spaces with cellular giant cell-rich cyst wall. (D) Cystic spaces and portion of cyst wall with scattered giant cells. No significant atypia is present.
