**1. Introduction**

Hydatid disease is caused by an infection with the cestode Echinococcus granulosus, It has been known since the time of Galen and Hippocrates, and was described by Thebesius in the 17th century [1, 2]. Rudolphy (1808) first used the term hydatid cyst to describe echino‐ coccosis in humans [1]. It's frequently encountered in sheep- and cattle-raising regions of the world and has been observed most often in Australia, New Zealand, South Africa, South America, and Mediterranean countries. Adult worms mature in the intestine of dog (defini‐ tive host) and the eggs are released in the stool. Animals like sheep get this disease by via ingestion of contaminated vegetables. When local people living in contaminated areas (acci‐ dental host) accidentally ingest eggs after contamination of the hands by handling dogs, on‐ cospheres hatch in the duodenum, penetrate the intestines and are carried via the bloodstream to various organs. (Fig1). About 70 per cent of hydatids lodge in the liver and develop there. Those that pass the liver are likely to travel *via* the right side of the heart to the lungs, which are second to the liver in frequency of involvement. Finally, a few embryos pass through the lungs and lodge in the systemic distribution, as in brain, bones, or kidneys. The presence of pulmonary hydatid disease should be considered in patients that present with a well-defined, spherical density of the lung, particularly in those who have lived or traveled in endemic areas.
