In cancer naso-sinusal, CT is used to detect a tumor, provide information about the extent of the disease, help plan treatment. Ojective : The description a lesion on the CT scan and compare with the clinical of the naso-sinusal cancer. Materials and Methods: Case study of 38 patients operateds at Hospital ENT Central (2007-2009). Diagnostic clinical, CT scan (and contrast given), histopathologies of HE, PAS and immunohistopathologic. Results and discussions: The advantages of CT is provide information about the extent of the base cranial and brain. The direction of the extent on the clinical is di stinguis only: the inner 86,95 percent, in front 75 percent, outside 70 percent, upper 50 percent, behind 33 percent. Conclusion is used to detect a tumor, provide information about the extent of the disease.