PT - JOURNAL ARTICLE AU - Ozan Karatag AU - Murat Cosar AU - Betul Kizildag AU - Halil Murat Sen TI - Dural sinus filling defect: intrasigmoid encephalocele AID - 10.1136/bcr-2013-201616 DP - 2013 Dec 05 TA - BMJ Case Reports PG - bcr2013201616 VI - 2013 4099 - http://casereports.bmj.com/content/2013/bcr-2013-201616.short 4100 - http://casereports.bmj.com/content/2013/bcr-2013-201616.full AB - Filling defects of dural venous sinuses are considered to be a challenging problem especially in case of symptomatic patients. Many lesions have to be ruled out such as sinus thrombosis, arachnoid granulations and tumours. Encephalocele into dural sinus is also a rare cause of these filling defects of dural sinuses. Here, we report an extremely rare case with spontaneous occult invagination of temporal brain tissue into the left sigmoid sinus and accompanying cerebellar ectopia.