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Background  As a noninvasive perfusion-weighted MRI technique, arterial spin-labeling (ASL) was becoming increasingly used to evaluate cerebral hemodynamics in many studies. The relation between ASL-MRI and crossed cerebellar diaschisis (CCD) was rarely discussed. In this study, the aim of our study was to assess the performance of ASL-MRI in the detection of crossed cerebellar diaschisis after stroke in compared with single-photon emission CT (SPECT).    Results  17 of 51(33.3%) patients revealed CCD phenomenon by the SPECT method. In CCD-positive group, CBF  ASL   of ipsilateral cerebellar were significantly increased compared with contralateral cerebellar ( p  < 0.0001) while no significant differences ( p  = 0.063, > 0.001) in the CCD-negative group. Positive correlation was detected between admission National institute of health stroke scale (NIHSS) and asymmetry index of SPECT (AI  SPECT  ) ( r  = 0.351,  p  = 0.011), AI  ASL   ( r  = 0.372,  p  = 0.007); infract volume and AI  SPECT   ( r  = 0.443,  p  = 0.001), AI  ASL   (r = 0.426,  p  = 0.002). Significant correlation was also found between cerebral blood flow of SPECT (CBF  SPECT  ) and CBF  ASL  , AI  SPECT   and AI  ASL   ( r  = 0.204,  p  = 0.04;  r  = 0.467,  p  = 0.001, respectively). Furthermore, the area under the receiver operating characteristic (ROC) curve value of AI  ASL   was 0.829.    Conclusions  CBF derived from ASL-MRI could be valuable for assessment of CCD in supratentorial stroke patients. Additionally, CCD was significantly associated with larger ischemic volume and higher initial NIHSS score.

Crossed cerebellar diaschisis after stroke detected noninvasively by arterial spin-labeling MR imaging