A retrospective study of 677 patients who underwent surgery for hepatic hidatidosis in the Department of Surgery A and B of the Hospital Miguel Servet in Zaragoza, Spain, over the last 21 years is presented. The frequency was analyzed in regards to sex, age, symptomatology, cyst data, surgical techniques performed and postoperative morbidity. The mean age of the patients was 39 years with the incidence being practically equal in both sexes. Dyspeptic symptoms (60%), hepatomegaly and/or palpable mass in the right hypochondria (58%) and pain (46%) were the most frequent clinical signs and symptoms observed. Radical surgery was performed in 21% of all the surgical treatments, while conservative surgery was undergone in 79%. Solitary cysts were most frequent (65.7%) with localization in the right hepatic lobe (65.4%). The most frequent postoperative complication was biliary fistula (72 cases). The rate of reintervention was 18% and operative mortality 1.6% with a mean hospitalization period of 25 days.