Computed Tomography (CT) are used as gold standard to evaluate the true anatomy of maxillary sinuses. Purpose: The aim of this work is Measuring Dimensions of maxillary sinus in different age groups, Detect Difference between the size of the right and left maxillary sinuses in relation with the age & Gender-related differences in maxillary sinuses. Patients and Methods: This study included 140 normal egyptian individuals had undergone mandatory head CT examination for other reasons. Results: After statistical analysis of the results , we found that age showed a significant positive correlation with right and left maxillary sinus volumes (p < 0.001) among studied subjects. There was no significant differences between males and females in all age groups and no significant differences between right and left sides in all age groups Conclusion: CT scan is a useful tool to evaluate dimensions of maxillary sinuses, maxillary sinuses could be utilized to assign the age .