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(15 and 2.5%, respectively, p <0.001, for the former; 32.4 and 1.7%, respectively, p <0.001, for the latter). Conclusions: In this series, one third of microcarcinomas were multifocal and 10% had lymph node involvement. Therefore, the aggressiveness of these tumors is higher than what is reported in the literature and they should be treated with total thyroidectomy (Rev Méd Chile 2005; 133: 1305-10).

Introduction: Extended hepatectomy has been associated with a high perioperative risk. The aim of this study is to compare the surgical results in patients who underwent a hepatic resection of more than two Couinaud's segments versus an extended hepatectomy (more than four segments). Methods: Our

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