**6. Discussion**

In endemic countries the Hydatid disease is still a national health problem and needs prevention for its eradication or its control [3]. Symptoms of hydatid disease depend on which organs are affected and only are evident when the complications arise, but most patients with hydatid cysts are asymptomatic, and the diagnosis is usually made incidentally during clinical or radiological examination for unrelated reasons [11, 12].

In our study of 56 cases, 29 (52%) were females and 27 (48%) were males in other studies the statistical analyses indicate that in children males are more likely to be infected with lung hydatid, while females were infected more with liver hydatid cysts [9, 13], result found also in our study; in total we found that the hydatid cyst disease in our children was no significative differences of affectation between the liver 41% and the lung 45%.

Hydatid cyst can affect any organ, but the two organs most involved are liver and lungs. The involvement of lungs, liver and other organs in the same patient in our study accounted in 8.9% of the cases.

The group of age commonest affected was from 5 to 10 years, in 32 patients (64%).

In human hydatid cysts Echinococcus granulosus is the most common cause as it was in our children, confirmed with histopathology of the endocyst (germinal, layer) this finding were also reported by other authors [13–17].
