Purpose: The parotid tumors is the most common salivary tuomors. CT scan imaging is the useful approach in order to evaluate the parotid tumors by the evaluative superiorities of mandibular invasion and expression of calcification over MR imaging. The analysis of enhancement pattems by using two-phase helical CT will be helpful in the differential diagnosis of salivary gland tumors. Purpose of this study is comparing clinical and CT scan imaging features with histopathological features of the parotid tumors. Object: 30 parotid tumor patients taken history and physical examination, pre-operative CT scan imaging included in this study, all patients taken post- surgery histopathological confirmation (Over a 1- year period in Nationallntitute of Odonto - Stomatology, Vietnam). Methods: The design of the study was the perspective and descriptive investigation. The clinical, CT scan imaging features recognized with designedpaper. all patients underwent two phase axial and coronal CT scan imaging (early and delayed phases30 and 120 second after venous injection of Ultravist) with helical CT scan machine, thickness of slice and table speed was 5mm, 5mm per second. Results: Mean of age: 49.3 (12 - 81 year old in range), 72 percent benign tumors presented in under 50 age group, 86 percent malignancies showed in un over 30 age group. 80 percent of patients presented their doctor when they had had symptom 12 months before. The facial nervous pain showed in 100 percent patients with parotid cancer and 86 percent ones had trismus. CT scan features revealed 73 percent benign tumors located superficial lobe, 57 percent parotid cancers and 75 percent parotid inflammations spreaded whole-gland. 100 percent malignant tumors had mixed and enhancement densities which showed in 87 percent benign tuomors. Conclusion: Parotid mass contained 73 percent true neoplasm which had 32 malignant tumors. The most of malignant tumors showed early locoregional invasion, trismus, persistent facial pain. The CT scan imaging features of true neoplasms revealed well - defined margin predominantly. CT findings of irregular tumor margin and infiltration into adjacent structures, mixed and enhancement patems, large size suggest malignancy. The most of the inflammations were spreaded whole - gland with hypodensity and no change in density. Accuracy of CT scan imaging were 93 percent in diagnosis of benign tumors, 100 percent in diagosis of malignancies, 87.5 percent in diagnosis of parotid inflammations.