CT feature of a calcified splenic mass probably hydatid cyst with diffuse hepatic steatosis (incidental findings) in a patient with chronic pyelonephritis.

Splenic hydatid infection is considered as a rare form of hydatid disease, and isolated splenic involvement is even less common. usually asymptomatic.

The spleen is involved in three situations:

• systemic dissemination
• intraperitoneal spread from a ruptured hepatic hydatid cyst 
• retrograde spread from the liver to the spleen via the hepatic portal and splenic veins in portal hypertension

The differential diagnosis for splenic hydatid cysts includes other splenic cystic lesions:

• splenic epidermoid cysts
• splenic pseudocysts
• splenic abscesses
• splenic hematomas
• cystic neoplasms of the spleen 
• intrasplenic pancreatic pseudocyst