Polycythaemia vera preceded by macrocytic anaemia.
D000740:Anemia / Q000150:complications*; D000748:Anemia, Macrocytic; D006801:Humans; D011087:Polycythemia Vera / Q000209:etiology*; D064028:Tracheophyta
ANEMIA, HYPERCHROMIC/complications; POLYCYTHEMIA VERA/etiology