Results The differences in age (t=2.034， P=0.043)， first Rotterdam CT score (Z=4.838， P<0.01)， GCS score (Z=4.440， P<0.01)， pupillary response (Z=3.235， P=0.001)， the length of time elapsed between the trauma occurred and the decompressive craniectomy (Z=3.874，P<0.01)， glucose level (Z=3.880， P<0.01) and cerebrum hernia magnitude (Z=2.529， P=0.012) were significant between the patients with hematoma expanded (n=120) and those without change in hematoma size (n=115). The results of the CART indicated that Rotterdam score got from the initial head CT ......