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A distinct clinicopathological entity called aneurismal bone cyst was described by Jaffe and Lichtenstein (1942). It is clinically, radiologically and pathologically characteristic, but the etiology and pathogenesis and nature of the lesion are debatable. These lesions are quite uncommon and any one having a large series of cases is unusual. We fortunately had the opportunity of studying 14 cases in the last 10 years. Most of them have already been published (Sivaramappa et al. 1968, Chari and Rao 1971, Chari and Reddy 1976). There are quite a few reports in which presence of associated lesions along with aneurismal bone cysts are described and the pathogenesis of the ancurymal bone cyst explained as a secondary phenomenon to the primary bone lesion (Buraczewiski and Dabska 1971, Biesecker et al. 1970). The following is an analysis of our 5 cases with associated pathology.