 My name is Dr. Muthu Sayez from AVMC, my topic for paper presentation is a comparative study of CT findings of colorectal carcinoma with their operative and historical findings. Introduction. Colorectal cancer is one of the most common GIT diagnosis that results in significant more detailed mortality. CT is being used for preoperative assessment of the growth and the involvement of adjacent structures, including the fat and pelvic muscles. At CT, colorectal cancer typically appears as a discrete soft tissue mass that narrows the colonic lumen. Colorectal cancer can also manifest as vocal colonic wall ticketing and lumen laryngeal. And complications of primary colonic malignancies such as obstruction, perforation and pistula can be readily visualized with CT. The local extension of tumor appears as an extra colic mass or simply as thickening and implantation of pericolic fat. Extra colic spread is also suggested by laws of flat planes between the colon and adjacent organs. Considering these points, the present study was planned with the Indian officials to assess the extent and the spread of colorectal malignancy on CT scan and to correlate CT findings with pre-op and histopathological diagnosis. The aim of the study is to assess the accuracy of CT scan findings and the spread of colorectal malignancy and to correlate these findings with the operative and the histological findings. Materials and method, this is a retrospective and prospective study which was carried out in AVMC and hospital to the cherry in the department of radio diagnosis for the period of 2 years. A total of 31 biopsy 21 patients showing a variable bowel wall ticketing involved in the colon rectum on the CECT were included in the study. The tumors were staged based on the CT scan findings and were compared with the operative and histopathological findings. The staging of colorectal carcinoma using pre-modalities like the operative, histopathology and CT scans has been subject to the interest of accurately defining the extent of disease. So this is an axial contrast-enhanced CECT image showing a heterogeneously enhancing and symmetrical wall ticketing involving the rectum. Here, this is a CECT sagittal, heterogeneously sagittal CT image showing heterogeneously enhancing wall ticketing involving the rectum with loss of patterns between the rectum and prostate that suggest to work in involvement. Now just the axial contrast-enhanced CT image showing a certain potential wall ticketing at the hepatic flexure. So now we will see the PNM classification of post staging of colorectal cancer. The primary tumor, Tx primary tumor cannot be accessed. T0 is no evidence of any primary tumor. Tis is a colorectal carcinoma. T1, the tumor invokes a sublimposa. T2, it invokes a muscularis propria. And T3, here the tumor invokes the muscularis propria into the subcerosa then into the pererectal tissues. T4, tumor directly invokes the other organ or structure and perpetrates the visceral petronium. The regional lymph nodes Nx, the regional lymph nodes cannot be accessed. N0, no regional lymph nodes, catastrophes. N1, catastrophes in 1, 2, 3 pericolic or perirectal lymph nodes. N2 is metastasis in more than 4 pericolic or perirectal lymph nodes. Distance metastasis, Mx, the distant metastasis cannot be accessed. N0, no distant metastasis. M1, distant metastasis. This is the discussion. Rectum was one of the most common site of involvement followed by the recto-signal involvement. Metastasis was observed in 5 cases out of 31 melignan cases. 5 of the 7 cases were correctly staged as T1, T2 lesions on safety. And having a sensitivity of 83.3% and specificity of 92% and positive predictive value of 71.4% and negative predictive value of 95.8% in the diagnosis of T1 and T2 lesions. 15 of the 16 cases were correctly staged as T3 lesions. And CT had a sensitivity of 82.2% and specificity of 93.8% and positive predictive value of 93.8% and negative predictive value of 86.7% in the diagnosis of T3 lesions. All 8 cases were correctly staged as T4 lesions and CT had a sensitivity of 100% specificity of 100% and positive predictive value of 100% and negative predictive value of 100% in the diagnosis of T4 lesions. Conclusion. Hereby I conclude that CT is an excellent modality in diagnosis of melignan lesion of colon and rectum. These are my reference. Thank you.