 Good morning to all the faculty and delegates. Myself, Dr. Dipanshu Swahak, I am a second-year resident in the department of cardiology from MMU-Mulana. My topic for today's paper is contrast and hence CT evaluation of oral cavity carcinoma. SCC is the most common malignancy in the oral cavity. Other oral cavity malignancies include minor salivary gland tumors, lymphomas, and mesogymal tumors. Imaging of the oral cavity and its subsides is complex. Imaging assist in accurate staging and planning of appropriate treatment benefits by allowing necessary surgical oridation therapy with a positive outcome, knowing anatomy and roots of spread of SCC, carcinodiagnostic assessment, disease classification, and optimal treatment planning. The aims and objective of this study is to evaluate the role of CECT in the staging of oral cavity tumors and comparing CECT staging to MRI staging. This study is a prospective cross-sectional study with an age group of adults. It was done in MIMSR, Mulana. The study was done from between January 2021 to December 2021 and the sample size was of 18. Inclusion criteria includes clinically suspected individuals and all the adults. Exclusion criteria includes pregnant females, those allergic to contrast, those with medical renal disease, and patients less than 20 years of age. In this study, 18 patients with strong clinical suspicion of CA of oral cavity were referred for CECT of the oral cavity. CT protocol includes plain CT exel sections with puffed cheek technique starting from skull base to sternal notch. With 60 to 70 mL IOhexol or IV contrast was given. Recon-slice thickness includes 1.25 mm and 3 mm exel and 3 mm coronal. The MRI sequences include T2 weighted exel, DWI exel, and STIR exel sequences. Using CECT and MRI, TNM staging results of oral cavity malignancy were compared with histopathological staging results obtained after incisional or excisional biopsy. The CECT exel image at the level of mandible shows irregular thickening of the left buccal mucosa. In these images, we can see the irregular thickening of left buccal mucosa extending anteriorly from left for smaller to remorse of left mandible posteriorly. There is erosion of adjacent mandible with extension in its marrow cavity. Sertal extension is also seen in left retro muller drag bone and the lesion is showing heterogeneous enhancement on post-contrast images. Then we come to the results. Following are the CECT's predictive validity for each of the TNM staging criteria with 100% positive predictive value in cortical bone involvement, mexilary sinus involvement and lymph bone detection and approximately 70% positive predictive value in deep muscle of tongue involvement and 72% in skin of face involvement and 69% in mastigator space involvement. Then below is the MRA predictive validity for each of the staging criteria used in TNM staging with 100% positive predictive value in mexilary sinus involvement, skin of face involvement and lymph bone detection with 94% PPV in cortical bone involvement, 97% positive predictive value in deep muscle of tongue involvement and 90% in mastigator space involvement. Then we come to observation and discussion. 30 participants with adjacent cortical bone erosion were identified in 4 out of 18 cases and CECT detected the involvement in all the 4 cases with 100% sensitivity and specificity. MRI showed deep tongue muscle involvement in 3 patients and CECT identified involvement in 2 patients with a sensitivity of 74.7% and specificity of 68.4%. Involvement of mexilary sinus was detected on CECT with 100% sensitivity and specificity. On MRI, facial skin involvement was observed in 3 patients of which CECT identified the involvement in 2 patients with a sensitivity of 81.8% and specificity of 79.9%. Involvement of mastigator space was detected in CECT with a sensitivity of 72.5% and specificity of 70%. On MRI, lymph nodes were detected in 4 patients of which CECT also detected all the 4 patients showing similarity in size criteria with a sensitivity and specificity of 100%. There was concordance of CECT's statistical equivalence with histopathological staging. CECT is the first choice of investigation in rural areas and reliable information of the involvement of bone, mexilary sinuses, skin and lymph nodes is provided. Now we come to the conclusion. Oral cavity malignancy is a common cancer in India. Treatment depends entirely on the tumor staging. CECT proves to be a reliable and accurate staging method. CECT has advantages of wider availability, higher compliance and lower cost. The analysis of a study revealed good levels of sensitivity and specificity of CECT when assessing the staging criteria used for oral cavity cancers and floor of mouth and tongue are better evaluated by MRI. Thank you everyone.