 Good morning, myself, Dr. Lokesh Verma, third year radiology resident from Pandit Vidhi 7th Post-Rajat Institute of Medical Science, Rohtak. My topic for presentation in the city-based conference being role of spiral city in detection and evaluation of mediasional masses. My purpose of the study was city characteristic of mediasional masses with regard to anatomical localization and extent, relationship to important structures, and tissue characterization with the help of Huntsville units. I have studied in 50 cases using a 28-slice CT scanner in the Department of Radiogenesis and Medicine of PJMS, Rohtak. It was a prospective study irrespective of agent sex, and it was a contrast-enhanced CT scan of the chest, and the classification used was the certain classification of mediasthenum. All the patients with mediasional abnormalities in CT were included irrespective of agent sex, and chest radiographs were available in all patients and were compared with the previous ones. And all the patients allergic to the contrast agents were excluded from the study. And the contrast material used was Omniopakar or Iohexal. And all the precautions like kneel by mouth at least four hours before the CT, and all the resistivity measures were taken actually. So out of my study of the 50 patients, I have found that in the most common cause was TB lymphadenopathy, out of 50 there was 26 cases followed by metastatic lymph shorts, then lymphomage, then the involvement of thymus, followed by high ethyl anhyngia, vasculabinol, neuroentric cyst, esophageal tumors, paraspinal abscess, hydrated cyst, neurogenic tumor, teratoma, pericardial cyst, and bronchocene cyst. These all are my cases. So case one is a 20-year-old female with weight loss and dyspnea. In the CC-taxial image, there was enlarged necrotic mediasional abs, bilateral preval thickening with thickened enhancing pericardium. So it was a case of TB lymphadenitis with pericarditis. Case two was a 14-year-old male, presented with acute airway compromise with dilated superficial veins in the neck and thorax. In the axial coronal and sagittal image, there was a large, lobulated solid mass in the anterior mediasional in the pre-vascular space, extending across the superior mediasional into the neck, compressing trachea, esophagus, and the superior venakava, displacing the branches of the aortic arch, posterior laterally. So it was a case of lymphoma causing superior venakava syndrome. Case three was a 63-year-old male with dyspnea. As you can see in the CC-taxial and sagittal scum, there is a large sacular aneurysm, arising from the distal arch and the descending thoracic aorta with peripheral thrombus, displacing the trachea bronchi anteriorly and causing the restructural vertebral bodies and ribs, and extending intraspinally also, and compressing the spinal cord. So it was a case of large sacular aneurysm descending thoracic aorta. Case four was a 52-year-old male with no chest complaint, but in the CC-taxial scum at the level of chest, there was a cystic mass with calciplication in the anterior mediasanum extending into the middle mediasanum. So it was a case of thymic cyst. Case five was a 40-year-old female with mastenia and gravies. As you can see, there is a homogeneous mass in the pre-vascular space in the anterior mediasanum with obscuration of fat plane between the mass and the main pulmonary trunk. So it was a case of thymoma in a patient with mastenia and gravies. Case six was a 64-year-old male presented with water brass. As you can see in the chest radiograph in the APN lateral, there was a retrocardiac mass with air field level extending below the diaphragm. So it could be a case of hietal aneurysm. And as in the CT scan, in the sagittal coronal and axial scum, we can see it's a sliding type of hietas aneurysm, but the GE junction is above the dome of the diaphragm. So it was a case of sliding type of hietas aneurysm. Then case seven was a 55-year-old female presented with dysphagia and dyspnea. And in the barium APN lateral film, there's a large filling depicting the midisophagus with proximal holdup of the contrast indenting on the posterior wall of trachea. It could be a malignant etiology. And in the CT, axial sagittal and coronal and 3D images also, there is a large heterogeneously enhancing sub-tissue mass arising from the posterior wall of isophagus. So it was a case of poorly differentiated carcinoma isophagus on FNAC. Case eight was a 48-year-old female with chest pain. As you can see in the axial image, there's a large heterogeneous mass in the posterior medial syndrome occupying entire the left lung with areas of calcification and fat component. So with the heterogeneous mass calcification of fat, it was a case of mature cystic teratoma. Case nine was a 50-year-old female presented with a per vaginal bleed due to total fibroid, but there was no chest complaint. And in the chest X-ray PA view, there was a well-depied mass in the right cardio-training angle, operating the right paraverteral line, and selecting the right heart, whatever the right heart border is well maintained. So it was a case of posterior medial senile mass. So, but in the axial CEC image, we can see a posterior medial mass in the right paraverteral region with mid-solid and cystic component. So it was a case of neuroentric cyst on FNAC examination. Case nine was a 26-year-old female presented with chest pain. As we can see in the CEC axial scan and in the T2 coronal image, we can see a large multi-loculated cystic lesion extending in all the compartments of the medial senile and along the pericardium. So it was a case of medial senile hydrated cyst with multiple doctor cysts also seen. Case 11 was a 42-year-old female presented with dyspnea. And the chest radiographs on the PA and the lateral view, there was a sub-carnal medial senile mass in the right bronchocis. As you can see, the sub-carnal location is most important here. And also in the CT, there's a well-dependent round sub-carnal cystic mass of water density. So in a sub-carnal location with water density, CEC is the most community was a case of bronchocinic cyst actually. So from all my observations, the maximum patients, 54% patients were more than 40 years age group and males were more commonly affected, 56% affected than females. And out of my 50 cases, histopathology was performing in 38% cases. But out of those 38, 36 were diagnosed on CT and CT was accurate in 36 or 92% cases and it was incorrect in actually 8% cases. So according to the CT imaging appearance, 35 cases were benign and 15 were malignant. So 70% were benign masses and 30% were the malignant masses. So from all these, we can conclude that CT delineated the abnormality and anatomic detail accurately in almost all cases. And with us conclude that medial CT is efficacious in detecting the disease, determining its extent and location and in increasing the confidence of diagnosis and obiating some other tests. Thank you so much.