Background and Objectives: The cerebral ventricular system contains a series of interconnecting spaces and channels which originates from the central lumen of embryonic neural tube. Cerebrospinal fluid filled ventricular system is an essential part of the brain. The evaluation of the size of the encephalic ventricle has great importance in diagnosis and monitoring of several pathologies. Hence this study wasundertaken, To examine the range in size of the normal lateral ventricles of the humanbrain. Methods: The study was done for the duration of Two years. Data for the present study was collected from the CT images done in the Department of Radiology, DMCH Darbhanga. The study group includes 100 males and 100 females. Conclusion: present study, it was concluded that there was great variation in measurements of parts of lateral ventricles of brain which showed statistically significant correlation with one another. The left lateral ventricle was shown to be larger than right in either sex while both lateral ventricles were larger in males.