<prompt> A company executive, who travels world wide, presents with upper abdominal mass and ye casonis test. The organism is -EchinococcusEntamoeba histolyticaHepatitisAscariasis  <response>: Ans. is a i.e., Echinococcus . Upper abdominal mass and positive casonis test suggest the diagnosis of hydatid cyst caused by Echinococcus. . Casoni test is an immediate type I hypersensitivity reaction. 