Aneurysmal bone cyst is a rare non-epithelialized pseudocyst of the jaws. Jaffe and Lichtenstein in 1942 were the first to recognize aneurysmal bone cyst as a distinct clinical and pathological entity while Bernier and Bhaskar in 1958 were the first to describe the presence of this lesion in the jaws. A case of aneursymal bone cyst in the maxilla is presented and the literature reviewed.