 Hello everyone, I am Dr. Sneha Chaudhary, second year post-graduate student in the Department of Rated Diagnosis, Maharshi Markandeshwar Institute, Mulana. The topic of my paper is role of MRI in evaluation of malignant lesions of oral cavity and tongue. Oral cancers are among the top three cancers in India. Among the malignant lesions, squamous or carcumus predominant, accounting for more than 90%. Most common risk factors include long-term overuse of alcohol and tobacco. Other risk factors are HPV, poor oral hygiene and positive family history of oral cancers. Five-year survival rates of oral cancer and oral and tongue cancer is approximately 50%. Cross-sectional imaging has become a cornerstone in pre-treatment evaluation of these cancers as it provides an accurate information about the extent and depth of the disease which helps in appropriate management strategy and indicate prognosis. CT and MRI are often complementary in assessment of oral cavity and oral pharyngeal pathologies. This is AGCC TNM classification of the oral cavity carcinomas. MRI readily reveals tumor invasion and spread to the surrounding structures due to its excellent soft tissue discrimination. So MRI can be used to assess the extent of local and regional tumor spread, the depth of invasion and the extent of lymph adenopathy. Also, MRI does not expose the patient to any harmful radiation and should also be used in the state of CT where dental fillings can obscure the region of interest. The sensitivity, specificity and accuracy of MRI in detection of mandibular invasion is also high and MRI can detect marrow invasion by the tumor involvement of the base of tongue, floor of mouth and extension into the oral pharynx. Ames and objectives are to evaluate the role of MRI in local regional staging of malignant lesions of oral cavity and tongue and to correlate these findings with clinical, surgical, anatomical and pathological findings. The study was carried out in the department of radio diagnosis in Maharshi Markandeshwar Institute. 30 cases were included in the study. The inclusion criteria was any histologically proven or clinically suspected malignant lesion of oral cavity and tongue and all the patients with contraindications to MRI were excluded from the study. The study was carried out on the 1.5 Tesla MRI machine and the MRI protocol is stated. The results and observation of my study was that the cancer was predominantly found in males while on site of involvement followed by buckle mucosa and alveolar followed by heart palate. The age incidence of my study showed that most of the patients were between 30 to 60 years of age group and my study showed a moderate agreement between the clinical and MRI T staging and a fair agreement between MRI and clinical N staging. A good agreement was seen between MRI and histopathological T and N staging while a poor agreement was seen between clinical and histopathological T as well as N staging. So the first case is of a female who presented with a non-healing ulcer on the left lateral part of the tongue which bleated on touch and histopathological studies revealed a moderately differentiated squamousal carcinoma. These are the MRI images which shows a large infiltrating mass involving anterior 2 third of the tongue and the base of the tongue appearing heterogeneously hypo intense on T1 weighted images whereas it appears heterogeneously hyper intense on T2 weighted images with a contralateral extension on the right side infiltrating into the floor of mouth involving glossopharyngeal circus, left tonsil, velicular, left paraphernal space and mastigator space with higher bone erosions and nodal deposits. This is the second case of a 67 year old male patient who presented with the ulcer on the right side of the tongue since two years he was a chronic smoker and of tobacco chewer. The histopathological reports were consistent with poorly differentiated squamousal carcinoma. The MRI images revealed an irregular ulcerated mass lesion which appeared hypo intense on T1 weighted images and heterogeneously hyper intense on T2 weighted images in the right little border of the tongue no involvement of the extrinsic muscles or any contralateral extension of bone erosions were seen. In this next case a 32 year old male presented with a complaint or difficulty in opening the mouth and pain in the left side of the jaw since three months and MRI images revealed a large heterogeneously infiltrating mass showing epicenter along the left bachal mucosa which appeared iso intense through the tongue muscles on T1 weighted images and hyper intense on T2 weighted images in extending till the left paraphernal space with involvement of the mastigator space and erosions of the left premise of the mandible. In the next case a female presented with a history of pain burning sensation past discharge bleeding with the ulcerative lesion in the right side of the alveolar ridge since four months. On the MRI images we can see the structure of the right maxillary alveolar arch by a large soft tissue lesion appearing iso intense through the tongue muscles on T1 weighted images and mildly hyper intense on T2 weighted images with associated destruction of the right entry floor. Intrasonous extension was also seen. Next case a patient presented with a complaint of pain and swelling over the right side of the cheek the patient was a chronic smoker and histopathology revealed a poorly differentiated squamous cell carcinoma. MRI images showed a large ulcerative proliferative soft tissue lesion centered in the right bachal mucosa appearing hypo intense on T1 weighted images and hyper intense on T2 weighted images with extensive destruction of the right half of the mandible with fracture and cranial deviation of the angle of the mandible. Last defect was seen along the right cheek with fistulous communication with the oral cavity. So to conclude my paper I would like to say that MRI showed a high correlation with histopathology for the thickness of the mucosal epithelium and both depth and width of the tumor. Preoperative estimation of the thickness of tumor and prediction of occult cervical nodal metastasis was satisfactory. The mucosal epithelium lamina propria and muscles of the tongue were clearly identified on MRI. New improvements in the MRI such as surface coil technology motion and flow compensation imaging strategies has made MRI as the modality of choice for assessment of oropharyngeal mouth and tongue soft tissue masses. TNM classification helps in planning treatment options. These are the references for my study. Thank you.