Megaloblastic anemia due to folic acid deficiency in polycythemia vera.
D000748:Anemia, Macrocytic / Q000209:etiology*; D005492:Folic Acid / Q000627:therapeutic use; D005494:Folic Acid Deficiency / Q000150:complications* / Q000188:drug therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D011087:Polycythemia Vera / Q000150:complications*
D005492:Folic Acid