Objective:To evaluate the features of vein pool of occipital diploe by CT scaning.Methods:The CT features of occipital diploic vein pool were analyzed retrospectively.Results:Of the 30 patients

13 were males and 17 females

their ages ranging from 38 to 78 years

with the average of 62.The vein pool of occipital diploe were located in or beside internal occipital protuberance.The CT imaging found chiseled bone destruction with the size from 2 mm×2.5 mm to 6 mm×10 mm

smooth edge and a thin layer of bone sclerosis

in 2 or more patients.The fusion could be found in all destruction of bone

with minority solitary bony defect found aroud it in 9 patients.Exoccipital and inoccipital bone showed balloon-like expansion to varying degrees

with compressed bone destruction of inoccipital bone found in 24 patients.No soft-tissue masses in occiput and posterior cranial fossa were found in all patients.The studies cases may be misdiagnosed as pathological destruction of bone

such as eosinophilic granuloma

epidermoid cyst

skull metastasis

even pacchionian impressions.Conclusion:CT can clearly demonstrate the occipital diploic vein pool

which helps for the diagnosis of this disease.