Clinical Findings (2) characteristic a acute: severe, self-limited(4-6w) seldom relapse b chronic: less severe, ofter relapse longterm 3. else: anemia(severe bleeding) mild splenomegalyClinical Findings (2)characteristic: a. acute:severe、self-limited (4-6w) seldom relapse b. chronic:less severe、ofter relapse longterm 3. else:anemia (severe bleeding) mild splenomegaly