 Hello everyone, I am Dr. Vanu Pesel from JJ Medical College. My paper is assessment of mediasthenal muscles using computer tomography. Anatomy of the mediasthenum. Mediasthenum is the extra pleural space within the thorax between the two lungs. It extends from the sternum anteriorly to the vertebral column posterior. The upper limit is formed by thoracic inlet and the lower limit by the F. Mediasthenum is divided anatomically into superior and inferior mediasthenum Wide wicks plane. The inferior mediasthenum is further divided into anterior, middle, and posterior mediasthenum with respect to pericardium. Anterior mediasthenum lies anterior to the pericardium. Middle mediasthenum consists of pericarium and posterior mediasthenum is posterior to pericardium. Felsen divided the mediasthenum into anterior, middle, and posterior mediasthenum with respect to two lines. One line is drawn along the anterior aspect of the trachea and posterior margins of the earth. Another line is a vertical line drawn along the thoracic vertebra one centimeter behind the anterior margins. Normal mid-sectional contents anterior compartment consists of thymus gland, substernal extension of thyroid and parathyroid glands, lymph nodes and connective tissue. Middle compartment consists of earth, pericardium, erotic arts and great visions, in nominate veins and superior velakeva, trachea and main bronchi, isla, lymph nodes, phrenic and upper vegas nodes and connective tissue. Posterior compartment consists of iso-vegas, descending aorta, azaegas and mesaegas vein, thoracic duct, lymph nodes, vegas nodes, sympathetic chain and connective tissue. Indication for the MDCT evaluation of the medias to define and characterize a media stynum abnormality suspected or diagnosed on plane radiograph. To evaluate the media stynum in patients who have normal chest radiograph at a clinical reason to suspect medias to disease in radiation treatment planning and follow-up, to aid biopsy or drainage procedure. Inns and objectives to evaluate MDCT characteristics of media stynum masses on plane and contrast enhance scans. Locate, differentiate and diagnose media stynum masses to study the involvement of neighboring structures by media stynum masses. Materials and methods, the main source of data for the study are patients from August 2020 to August 2021 of Bapuji Hospital and Chikteri General Hospital, Tharagiri. Referred patients were evaluated through detailed history, necessary physical examination and computer tomography is carried out using GE Revolution MDCT machine. Inclusion criteria, computer tomography study of the media stynum was conducted in clinically suspected cases of medias to normal masses. Patients were the just radiograph showed the evidence of media stynum mass lesion. Exclusion criteria causes including aorta and cardia. Traumatic cases, various types of hernias. Results, in this study out of total 26 patients, 14 were male and 12 were female. The majority of cases were in the age group between 50 and 75 years. Among these cases, anterior media stynum masses were 27%, middle media stynum masses were 19% and posterior media stynum masses were 54%. Out of 26 patients, 9 patients were diagnosed with medias to normal mass. 6 patients with CA distal isophagus, 3 patients with lymphoma, 2 patients with extending thyroid lesion. 1 patient each with neurointric cyst, isophageal duplication cyst, parisophageal abscess, soft tissue lesion in the left pleural space, malignant lesion in the posterior middle aspect of left thorax and thymoma. These are the axial and coronal CT images where there is anterior medias to normal mass with the widening of the media stynum. There is no significant compression or invading of the medias to normal structure. There is associated bilateral pleural effusion and underlying lung collapse. This is another case where there is a medias to normal mass noted encasing the medias to normal structures without any compression or obstructive features. These were diagnosed to be cases of lymphoma. This is the axial, societal and coronal image showing a cystic lesion in the left lateral aspect of the lower thoracic vertebra. This was diagnosed to be a neurointric cyst. This is the axial CT image of a patient showing metastatic lymph nodal mass invading the esophagus and same patient showed multiple lytic lesions in the vertebra and multiple liver meds. There was associated thromboembolism and pulmonary infarct. This is the axial CT image showing circumferential thickening of the esophagus at the level of the carina which was diagnosed to be a CA esophagus. Other patient showing thickening of the esophageal wall in the lower esophagus which was diagnosed to be CA esophagus. This is the societal image of the patient of her esophageal herpesis. In our study of 26 cases, cuff was the most common clinical symptom constituting 44% followed by dyspnea 36%, fever 20% and chest pain 20%. According to Davis et al study in 400 consecutive patients with medias to normal mass, chest pain constituted the most common symptom that is 30% followed by fever 20%. Compartmental distribution of medias to normal masses. Among these masses, anterior medias to normal masses were 27%, that is 7 cases. Middle medias to normal masses were 19%, that is 5 cases. And posterior medias to normal masses were 54%, that is 14 cases. Out of 26 patients, 9 patients were diagnosed with medias to normal mass, 6 patients with CA distal esophagus, 3 patients with medias to normal lymphoma, 1 patient each with neuroenteric cyst, esophageal duplication cyst and paraisophageal herpesis. Conclusion, multi-director raw computed tomography plays a significant role in the assessment of various medias to normal pathology which were initially detected on the chest hydroderma. The maximum number of cases occurred in the 5th and 7th decade and slightly more common males. In our study of 26 cases of medias to normal masses, the posterior medias to normal masses consisted of 50%, anterior medias to normal masses were 30% and the middle medias to normal masses consisted of 19%. Out of 26 patients, 9 patients were diagnosed with medias to normal mass, 6 patients with CA distal esophagus, 3 patients with medias to normal mass. MTCT is a promising 3D imaging tool which allows substantial anatomical volumes to be routinely covered with isotopic sub-millimeter spatial resolution useful for the investigations of medias to normal masses. So, we conclude that multi-director raw computed tomography definitely has a major role to play in the evaluation of medias to normal masses. These are my references. Thank you.