 Good morning, everyone. I am Dr. Siddharth Goyal, first year PG in the Department of Radio Diagnosis at Kalinga Institute of Medical Sciences, Bhubaneswar. The topic for my paper presentation is Evaluation of Lung and Mediastinal Masses by CCT and its Histopathological Correlation. So the basic aims of the study are to delineate the common locations where lung masses occur, characterize them into benign and malignant and assess the extent of the disease by CCT. Then we will understand if there is any correlation or how many cases assess the sensitivity and specificity with the histopathology, which is taken as a gold standard. So this is a descriptive study which was done over a period of 8 months in Bhubaneswar at Pine Institute. Total 50 cases were taken. Statistical analysis was carried out with the help of Microsoft Excel. The CT machine used was a GE Optima 64 slice CT scanner which had a 5mm slice thickness. Contrast was used wherever necessary with the help of UltraVist, which was put in a dual syringe detector. And the image was taken at 40 seconds post-contrast injection and reconstructed with a slice thickness of 0.625 millimeter. A patient consent was taken and patient was informed about the procedures before only. Inclusion criteria. Inclusion criteria and exclusion criteria as well as inclusion criteria were patient with lung masses who had undergone CCT and histopathology both at our institute. Whereas patients who agreed to undergo USG or CT guided biopsy in our institute following CCT were also taken into account. Exclusion criteria were patient in whom either CCT wasn't done or only histopath was in or either CCT was done or patient on which contrast could not be given as in patients who have contrast and sensitivity or abnormal RFT. So these were the spectrum of findings we assessed. We assessed lesions both within the lung parent schema and media standard lesion. Among the lung masses most commonly we found was the lung cancer and among lung cancer also the incidence of adenocarcinoma was the highest. This was followed by the square muscle cancer. Then around equal cases we saw for large cell carcinoma and non-cell carcinoma. Then a lot of cases we saw of lung mass in the form of TB which presented as a cavitatory lesion or isolated lymphedinopathy which had turned out to be a medistinal lymph node or TB lymphedinopathy. Among medistinal masses most commonly again we saw CA lung and teratoma cases. Among medistinal lung masses in the medistinal, teratoma was the most common. So then we correlated our findings in CECT with that of histopathology and found that the sensitivity of CECT in diagnosing them is around 97% and I found that CECT is an ideal modality for at least sensitivity of the mass. Pessivity and positive predictive value of CECT also when compared with histopathology it was taken as board standard which saw them to be high. So these are just the delineation of the spectrum of lesions which we saw. As you can see adenocarcinoma was the highest number of cases. This was followed by the square muscle carcinoma. Then again among medistinal lesion teratoma turned out to be more common once then infective etiology like TB was also there. Then again spectrum of lesions on histopath also had the same as delineated by the CECT telling us that the CECT has a good capability of diagnosing these lesions. So in our study total 50 cases were taken. Out of this 30 turned out to around 30 turned out to be lung caches. Of these 18 cases were diagnosed as adenocarcinomas and 12 were diagnosed as squamous carcinomas. Amongst medistinal muscle most common was teratoma. The sensitivity, specificity and positive predictive value of lung carcinoma correlation of CECT was pretty high. It was 97%, 97% sensitivity, specificity was 94% and negative predictive value was 50. In our study we also saw that the common demographics in which this happens is they usually the age group of 40 to 60 years and a mean age was found to be 52 years and majority of cases were more commonly seen in males and also more commonly associated with smoking. Then we did some clinical correlation also and cuff and sputum production turned out to be the most common clinical presentations of these cases. Among benign lung masses most of the cases about 66.6% showed homogeneous enhancement whereas 33% showed a heterogeneous enhancement. Among malignant masses most of them showed a heterogeneous pattern of enhancement and very rarely we saw any homogeneous pattern very few around 2% of cases. Among benign medistinal masses again we saw a homogeneous pattern and among malignant again same in medistinal masses we saw a heterogeneous pattern. Then common findings which were associated in malignancy were its central location, a rib invasion or medistinal invasion is there. We'll see a irregular lesion with heterogeneous enhancements showing speculated margins and if the lesion has smooth or lobulated margins with homogeneous enhancement will go towards benign. Then associated findings like pleural effusion, consolidation, collapse, cavitations were more commonly seen with malignant lesions. So the conclusion was that CECT diagnosis of lung and medistinal masses were aberrated with the histopathology in 45 cases out of the 50 cases and lung masses were more commonly seen in the upper load and medistinal masses were more commonly seen in the anterior compartment. So because of its high sensitivity, specificity and PPV CECT was found to have a good diagnostic accuracy and was recommended as the modality of choice for diagnosis of lung and medistinal lesion. However in some cases like in cases where we have to differentiate between TB and malignancy histopath played a more important role in differentiating between them. CECT was non-specific. These are my references. Thank you.