Solid variant of aneurysmal bone cyst

Background and Methods. Of the 200 cases of ABC in the Rizzoli Institute files, 15 had solid features on both gross and histologic examination. Inasmuch as fibrous proliferation with giant cell and bone production along with fibromyxoid areas and small aneurysmal spaces were found in the solid parts of the aneurysmal bone cyst, a grossly solid and radiographically osteolytic bone lesion with these microscopic features was called a solid aneurysmal bone cyst. Some authors call the same lesion extragnathic giant cell reparative granuloma.