Hydatidosis is a zoonotic parasitic disease caused by the dog tapeworm Echinococcus and its larval stage, the hydatid cyst. Humans can accidentally become intermediate hosts by ingesting the eggs of the tapeworm. While most cysts deve lop in the liver and lungs. animals. At present, four species of the genus Echinococcus are recognized and regarded as taxonomically valid: E. granulosus (cystic hydatidosis), E. multilocularis (multivesicular hydatidosis), E. vogeli (polycystic hydatidosis) and E. oligarthrus (Soulsby, 1982). A total number of 23 patients were included in this study. 13 patients were females while the rest 10 were male patients. All cases were properly diagnosed as Hydated disease and then treated in the surgery Department of Algmeil Hospital (Libia) in the last 2 years (2002 and 2003). Proper investigations as well as treatment were carried out. The obtained results were statistically analyzed. Four types of presentation of the disease were observed in this study and presented, Asymptomatic 78.26%, Obstructive jaundice 8.69%, Accidental rupture 8.69% and Pressure symptom 4.34%. In spite of the progress in these areas, echinococcus/ hydatidosis remains a serious public health problem in a number of countries. It is very important to support and implement new control programmes so as to prevent further spread of the disease. Research in possible vaccines is essential in order to supplement the existing methods of breaking the Echinococcus life cycle.