 Hello everyone, my paper presentation topic is imaging and histopathological correlation of lung and midiastinal masses of cross-sectional study, presented by Dr. Kadi Srinich, junior resident, department of radio diagnosis, G. M. Sepota. Games and objectives of my study are the study was undertaken to establish the role of CT in comprehensive evaluation of lung masses and to study the efficacy of CT-guided fine needle aspiration cytology with the histopathology. Lung cancer is the commonest fetal malignancy in both men and women. Bracharsanoma bronchus is by far the commonest and most important primary tumor of the lung. Lung cancer is the only visceral malignancy which gives an early-roentrant clue of its existence. CT serves as a dual role in the patient's expected to have a lung charsanoma based on the plane-gestase radiograph. Initially, it may substantially facilitate the diagnostic evaluation by providing more precise characterization of the size, contour, extent and tissue composition of a suspicious region. For lesions which are indeterminate on CT evaluation, trans-cellastic fine needle biopsy can be performed on such lesions using CT guidance. Materials and methods. It's a cross-sectional type of study which included 50 patients who had undergone CT CT chest in the department of radio diagnosis, Kota Rajasthan, for any respiratory symptoms and suspected of having a lung or a midiastinal mass on X-ray or on clinical basis. Patients were subjected to CT-guided fine needle aspiration cytology for histopathological diagnosis after a mass was detected on CT chest. Inclusion criteria were patients with respiratory symptoms and suspected of having a lung mass were included. Patients willing for needle biopsy were also included. And the exclusion criteria were patients already diagnosed with a lung or a midiastinal mass on a CT chest and patients unwilling for needle biopsy and patients with abnormal RFD were excluded. Here's the image of case one. It's a 12-year-old female presented with respiratory symptoms and was suspected of having a lung mass on chest X-ray. It shows a heterogeneously enhancing posterior midiastinal mass with internal calcification with adjacent ribbell moment and neural foraminal extension indicating a neural origin tumor which was diagnosed at Paraya anglioma. Case two shows a image of heterogeneously enhancing mass with internal necrotic areas involving entire right middle loop and adjacent anterior segment of the right upper loop with the midiastinal lympheninopathy and of the lesion also had, the case also had hepatic and bony metastasis. Case three shows a lobulated heterogeneously enhancing soft tissue density mass in the posterior superior segment of right lower loop forming an acute angle with the chest wall reaching up to the posterior. Case four shows an image of a irregularly heterogeneously enhancing mass in the apicoposterior segment of left upper lobe indicating the adjacent, invading the adjacent part of second rib, T2, T3 vertebral body, posterior vertebral junction of the second vertebra, suggesting a pancost tumor. Results of my study are CT evaluation of lung masses were carried out in 50 patients referred to the department of radio diagnosis with the primary objective to define the nature of the abnormality and to provide a possible diagnosis in terms of malignant or benign vision. Biopsy was performed under CT guidance in 50 cases. The observation regarding demography, clinical and other diagnostic procedures, CT evaluation and FNAC are compiled here. On CT, 82% of the cases were primary lung masses, 8% of the cases were diagnosed as lung metastasis, 2% of the cases were neurogenic in origin and 2% of the cases were thymoma, 6% of the cases were medial-stimul lymph nodal masses. On histopathological diagnosis, 15 cases were, 15 cases turned out to be adenocarcinoma among the 41 primary lung masses, 9 were small cell casinoma, 8 was mammoth cell casinoma and 5 turned out to be large cell casinoma and 3 were diagnosed as other infective etiology which were not in the primary lung masses and 3 were lymph nodal masses, 1 was a thymoma and 1 was a neurogenic tumor which is a paraganglioma and 4 were lung metastasis and 1 was a parsimony tumor. Morphology of lung masses on CT, 5 out of the total cases were of size 4 to 6 cm, 10 out of the total cases were 6 to 8 cm, 12 cases were 8 to 10 cm of their size and most of the cases which is 14 were more than 10 cm in size. 5 cases had smooth margins for the contour which indicated a benign etiology, 12% 12 cases and 24 cases had lobulated antipregular contour indicating towards the malignant lesion. Solid hemo homogenous lesions were 11, solid hemo homogenous lesions were 30 and the 3 lesions had central calcification, 5 lesions had peripheral calcification and none of the cases had air program. Other demographic details from my study, 78% of the population were male predominance, 22% of the population were females and 8% of the cases belong to less than 20 years of age, 12% belong to 20 to 40 years of age, 28% belong to 40 to 60 years of age and 52% belong to above 60 years of age. Based on CT evaluation and guided biopsy of lung mass lesions, there were 86% malignant and 14% benign lesions. Among the malignant, 82% were primary lung masses and rest 18 included other medial senile masses and the metastatic lung lesions. In the malignant group, majority were adenocarcinoma which was 15 in number contributed to 40% followed by small cell carcinoma which were 9 in number contributed to 24% followed by small cell carcinoma which were 18 number and were 21%. Lesions having smooth margins on CAC test indicate a benign etiology and the lesions with irregular and lobulated margins indicated towards the malignant lesion. In patients want to have primary lung mass, adenocarcinoma was the most common pathological type found on a needle biopsy. Male to female ratio was 3.5 is to 1 and most cases with lung masses belong to age group of 60 to 80 years with average of minute 60 years. Most of the malignant lesions had size of more than 8 cm and a regular margin. Most of the lung masses had inhomogeneous density and flu had both central and peripheral calcification. In addition to morphological evaluation, CT provides an additional information regarding the staging of the disease which increases the specificity and sensitivity of the CT towards diagnosis. CT-guided affinity is of utmost use in cases where pre-biopsy evaluation and imaging suggests that the probability of malignancy is high and present. These are my references. Thank you.