 Hello, everyone. Myself, Dr. Vinay Aadha, PC's resident and department of radio diagnosis, ABMS and Dr. RML hospital, New Delhi. Title of my paper is Role of multi-detector computer tomography in evolution of renal masses. Introduction, detection of renal masses and their differentiation from their benign counterparts is extremely important, especially when these masses are small. CT is the most sensitive imaging modality for detecting and characterizing the renal masses as solid lesion, simple cyst or complex cysts. MDCT with speed, easy availability and multi-planar reformatting capabilities has emerged as the single most useful tool for characterization of renal masses. Aim, to find out the role of MDCT in evolution of renal masses and to differentiate between benign and malignant renal masses. Materials and method, when you have the studies conducted in our department, study type is cross-sectional observation study. Study duration is 1st July 2022, 1st July 2021. Sample size is 55 cases. Inclusion criteria, patients of all ACE group who have been clinically suspected to have renal masses and being sent to our department were included in the study and methodology. MDCT on 128 slice semen's somatom was done in all patients with clinically suspected to have renal masses and ultrasound. Results, a total of 55 patients were included in the study, out of which 25 patients, 45% were of benign group which included renal cis, 20% renal abscess, 8% renal hydrated, 4% polycystic kidney disease, 16% reninoma, 4% oncocytoma, 16% angiomyelipoma, 32% and 30 patients that is 55 patients were of malignant group which included renal cell carcinoma, 40%, transition cell carcinoma, 16.6%, women's tumor, 13.3%, renal lymphoma, 10%, metastasis, 6.6%, renal sarcoma, 3.3%, multi-locular cystic nephroma, 3.3%, P-net, 3.3% and reptomyosarcoma, 3.3%. Now cases. First is renal abscess. Here there is a hypodense collection with peripheral enhancing wall is seen indenting the renal parenchyma at the interpol region in the right kidney. And there is a another small hypodense collection with peripheral enhancing rim is seen in the interpol region of the left kidney. And there is a marked perinephic fat standing also seen. Now second case, angiomyelipoma. Here there is a well defined, lobulated solid mass lesion with predominant fat atination is noted in the lateral aspect of the lower pole of the right kidney measuring around 3.5 centimeter. And the solid component shows post contras enhancement. Now third case is renal oncocytoma. Here there is a large heterogeneously hypodense mass lesion with central known enhancing scar is seen arising from the interpol region of the left kidney. And it is heterogeneously enhancing. The lesion is causing mass effect in the form of medial displacement of the upper ureter as playing of the higher vessels and PCS system. Fourth case is renal cell carcinoma. Here there is a well defined heterogeneously enhancing mass lesion seen arising from the mid and lower pole of the right kidney with internal cystic areas along with the thickening of gerotas, fascia, lateroconal fascia and proximal rhetoric wall thickening is also seen. And there are multiple round to avoid variable sized habitatory lesions are seen scattered in the bilateral lung fields with invasion of the left inferior pulmonary vein, likely metastasis. So staging is T4N1 and N1. Fifth one is transitional cell carcinoma. Here there is a heterogeneously enhancing soft tissue mass lesion seen involving the left renal pelvis and it is extending to involve the left proximal ureter and causing hydro ureter nephrosis. And there is also a heterogeneously enhancing soft tissue mass lesion seen involving the posterior and left lateral wall of the urinary bladder with involvement of the left VUJ with upstream dilatation of the ureter. Next is Wilms tumor. Here there is a large well defined circumscribed heterogeneously enhancing mass lesion is seen replacing the left kidney with multiple known enhancing areas within the lesion likely cystic changes, few calcific foci and fat density also noted within the lesion and the lesion is causing spleying and displacing the renal PCS system anterior medially and the lesion is also causing mass effect and displacement of the adjacent organs. Next is metastasis. Here there is a heterogeneously enhancing exophytic mass lesion seen at the lower pole of the left kidney. So basically this is a case of cervical lymph node biopsy proven case of metastatic neuroendocrine tumor where we can see multiple heterogeneously enhancing nodules seen in the thyroid gland with bilateral cervical and axillary and medicinal lymphadenopathy and there is also a well defined lytic lesion with sclerotic margins is seen in the CPY vertebral body. So possibility of medullary carcinoma thyroid with metastasis to the lymph node kidney and bones. Next is peanut neuroctodermal tumor. Here there is a large well defined heterogeneously enhancing mass lesion seen involving the right kidney and there are few tiny foci of calcification seen and some non enhancing areas also seen likely necrosis and there is an invasion of the right renal vein by the mass lesion, invasion of IVC and also seen. Here we can see the infiltration of the liver and the right crust of diaphragm and right source muscle is also involved infiltrated and the lesion is causing mass effect on the surrounding organs and the in the chest we can see multiple heterogeneously enhancing plural and pulmonary and medicinal deposits. So in a view of young age and aggressive tumor with extensive metastasis possibility of peanut is considered. Discussion, the study was carried out in our hospital over a period of one year on 55 patients and calcification was seen in approximately 35% cases of the RCC and malignant renal masses showed more amount of necrosis compared to benign masses that is 60% in RCC and 100% in venous tumor. Renal vein invasion was seen in 33% cases of the RCC while none of the benign lesion showed invasion. Renal transitions and carcinoma were associated with hydronephrosis in around 50% cases. The most common site of metastasis from RCC was to lymph node around in 40% cases and in lungs around 18% conclusion MD city can be used as a single most powerful tool in the preoperative diagnosis and staging of renal masses references. Thank you.