[Sonographic diagnosis of mesothelial cyst of the diaphragm]

We present a case of a female patient of 65 years of age, who was referred to our clinic for surgery because of a suspected intrahepatic cyst, and who was suffering from upper abdominal complaints. Detailed sonographic examination revealed a cystic process outside the liver, the respiratory shift of structures during the sonographical examination being the criterion. However the final diagnosis of a mesothelial cyst of the diaphragm was possible only after laparotomy and histological examination.