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Copyright ©2012 Baishideng Publishing Group Co.
World J Gastroenterol. Apr 7, 2012; 18(13): 1448-1458
Published online Apr 7, 2012. doi: 10.3748/wjg.v18.i13.1448
Table 1 Hydatid disease epidemiology and characteristics[6,7]
Cystic echinococcosisAlveolar echinococcosis
Causative agentE. granulosusE. multilocularis
Definitive hostsDogs and other canids (coyotes, dingoes, red foxes)Red foxes, arctic foxes, coyotes, dogs and cats
Intermediate hostsUngulatesRodents
Geographic distributionWorldwideNorth America, northern and central Eurasia
Worldwide incidence1-200/100  0000.03-1.2/100  000
Organ localizationMainly liver and lungsMainly liver
Characteristics of hydatid lesionsYoung cysts: spherical, fluid-filled, unilocular vesicles (diameter: 1-15 cm) Old cysts: internal septations, daughter cysts Three-layered structure: germinal layer, laminated layer, pericystAlveolar-like pattern, with numerous vesicles (< 1 mm up to 15 cm in diameter) and surrounding dense connective tissue, no cyst fluid, sometimes central necrosis
Type of growth in human organsConcentric expansionTumor-like, infiltrative behaviour
Therapeutic optionsSurgery, PT (especially PAIR), chemotherapySurgery, chemotherapy, EPIs