LEGUME-ASSOCIATED RESIDUAL CYST

This report describes three unique cases of residual cyst (RC) which w ere characterized by large legume implants. To determine whether these represented a distinctive RC subset or if implanted materials have ge neral importance in RC pathogenesis, a retrospective comparison of the se cases and 37 further RCs with 40 control periapical cysts was perfo rmed. The frequency of foreign material implantation and the associate d histopathologic features were assessed. No significant differences w ere noted suggesting that foreign implantations do not have an etiolog ically significant association with RCs and that the legume-associated RCs represent a unique subgroup. The relationship of the legume-assoc iated RCs to the category of lesions variously termed giant cell hyali ne angiopathy, oral pulse granuloma or hyaline ring granuloma is discu ssed.