title: A case of pyrexia of unknown origin.
mesh_terms: D002764:Cholecystitis / Q000150:complications*; D002769:Cholelithiasis / Q000150:complications; D005335:Fever of Unknown Origin / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011087:Polycythemia Vera / Q000150:complications*