Primary Hydatid Cyst of the Spleen

The larval form of the genus Echinococcus, of which Echinococcus granulosus is the most common, causes hydatid disease. The liver and lungs are the organs most commonly involved. Splenic involvement in hydatid disease is uncommon, representing less than 2% to 3.5% of all human infestations by Echinococcus [1,2]. The infestation of the spleen usually takes place by arterial route after the parasite has passed through the two filters, hepatic and pulmonary. The retrograde venous route which avoids the liver and lung, is also considered [3].