الفهرس 
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Abstract
The sinonasal area is affected by a wide spectrum of tumor and tumor like condition that presents usually by nonspecific symptoms. The heterogeneous nature of its pathological lesions makes the treatment choice varied from limited to advanced surgery with or without post-operative chemo or radiotherapy.When sinonasal mass is suspected, CT and MRI are well established as imaging studies that can map the mass accurately expecting its vascularity. However their ability to differentiate between benign and malignant tumors is limited and depends on some imaging features as bone destruction and local infiltration. Functional imaging modalities have been studied hoping to detect the nature of the sinonasal masses. They showed good performance in differentiation between malignant and non-malignant masses. However to our knowledge, these previous studies about functional imaging were limited by overlap between the malignant and non-malignant masses and between the benign and non-neoplastic masses. So, the objective of this work was to assess the usefulness of DWI-MRI, DCE-MRI, and MRS for the differentiation between sinonasal masses. Also, we assessed the role of CTA in evaluation of these masses. Patients clinically or radiologically were suspected to have sinonasal mass were referred from ENT Departments of Mansoura university hospitals for radiological evaluation. Convectional CT, CTA, conventional MRI,DWI-MRI with calculation of ADC value, MRS with calculation of Cho/Cr ratios, DCE-MRI with analysis of the shape of the curve and the semi-quantitative parameters were done. The cases were classified into three groups: malignant, benign, and non-neoplastic.