[Pyoderma gangrenosum and Vaquez' disease].
D006801:Humans; D008297:Male; D008875:Middle Aged; D011087:Polycythemia Vera / Q000150:complications*; D011711:Pyoderma / Q000209:etiology*; D012883:Skin Ulcer / Q000150:complications*
Pyoderma gangrenosum et maladie de Vaquez.