الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The oral cavity constitutes a complex anatomical region divided into numerous spaces and subspaces that can be affected by many developmental, inflammatory, and tumoural pathological conditions. Oral cancer has an overall survival rate of only 50%. This prognosis is significantly improved when this disease is diagnosed and treated in its early stages. Certain cases of oral cancer, especially in its early stages, can be clinically deceptive and can be misdiagnosed. The mortality rate for oral cancer is high since it is often diagnosed in its later stages, despite the fact that it can be early detected by standard oral examination. Therefore, we conducted this study to evaluate the efficacy and accuracy of imaging using CT, MRI and ultrasound in detection of oral cavity and oropharngeal masses. The results could be summarized as follow: This study included 30 patients with oral cavity and oropharyngeal masses who carried out at Diagnostic Radiology and Medical Imaging department in conjunction with Otolaryngology department Tanta University Hospitals. The mean age of included patients was 43.8 years old, 53% were male. Symptoms of included patients were as swelling in 13 (43.3%), Painful swallowing and dysphagia in 8(26.7%), pain in 8(26.7%). The most common sites of primary lesions were in the tongue in 5 (16.7%) patients and parotid glands in 5(16.7%) patients followed by palates in 4 (13.3%) patients. The tumors were Malignant in 16 (53.3%) patients and benign in 14(46.7%) patients. The Malignant tumors were as squamous cell carcinoma in 8(26.7%) and Carcinoma ex Pleomorphic Adenoma in 3(10.0%). The most common benign tumor was Pleomorphic Adenoma which was diagnosed in 6(20%) patients. There was no statistically significant difference between Benign and Malignant tumors in the sites. In Ultrasound findings, 88.89% of tumors were hypoechoic, 55.6% were well-circumscribed and 44.4% were lobulated. Ectopic thyroid and thyroglossal cyst were easily detected by neck ultrasound. But Ultrasound couldn’t differentiate between Carcinoma ex Pleomorphic Adenoma versus Pleomorphic Adenoma. Regarding TNM classification, the majority of benign tumors were classified as T1 and T2. While, the majority of malignant tumors were classified as T2 and T4. The size of malignant tumor was bigger than benign tumor. Involvement adjacent structures was more prominent in MRI images. All Pleomorphic Adenoma had hyperintense T2-weighted and 83.3% had hypointense T1-weighted. ADC was higher in Pleomorphic Adenoma than Carcinoma ex Pleomorphic Adenoma. MRI had superiority in the diagnosis of Carcinoma ex Pleomorphic Adenoma and Pleomorphic Adenoma than CT. CT had Sensitivity 77.78%, Specificity 75% in detection of malignancy. Low apparent diffusion coefficient can detect malignancy with 61.11% Sensitivity and 91.67% Specificity There was a statistically significant difference between CT and MRI regarding the detected tumor size. Enlargement of Lymph node >5mm was observed in 17 patients using CT and in 20 patients using MRI. Involvement of adjacent structures/ deep lobe involvement was observed in 7 patients using CT and in 12 patients using MRI. Calcification was observed in 2 cases by CT and not observed using MRI. Size of malignant tumor detected by MRI (3.17±0.95) was higher than those detected by CT (2.96±0.92) (p=0.011).