Objective:To investigate the MRI findings of posterior fossa hemangioblastomas and to improve the diagnosis ability for this disease.Methods:The MRI findings of 58 patients verified by surgery and pathology were analyzed retrospectively. Results:Among 58 cases of hemangioblastomas (68 lesions) cases there were cyst type in 48 cases and solid type in 20 cases.Large cyst with a small hypervascular mural nodule which often abutted on brain surface were the characteristic manifestation of the cyst type.Singal intensity of solid type was slight hypointense or isointense on T 1WI,and marked hyperintense on T 2WI.Unusual enlarged vascular flow void signals within or around the tumors also could be seen.Contrast-enhanced scan was helpful in detection of the lasion and characterization of the disease.Conclusion:MRI findings of posterior fossa hemangioblastomas are characteristic and the disease can be preoperatively diagnosed,but it should be differentiated from pilocytic astrocytoma,meningioma,metastasis and arterovenous malformation (AVM).