Perianal abscess as a presenting sign of leukemia.
D000038:Abscess; D001004:Anus Diseases / Q000209:etiology*; D005401:Fissure in Ano / Q000209:etiology; D006801:Humans; D007938:Leukemia / Q000150:complications / Q000175:diagnosis*; D007945:Leukemia, Lymphoid / Q000150:complications; D008297:Male; D008875:Middle Aged