 Hello everyone, my sub-doctor Nuresh Kumar, my paper presentation on role of CT imaging in tetropionyl mass. Ames and objective review the main ideology of the malignant tetropionyl masses at our institute and the CT imaging feature. Material and method retrospective study of patients having malignant tetropionyl masses was done. Imaging findings of the CT were noted, different radiology sign was studied which helped to identify the localization of the abdominal mass. Case list, CT scan is the most suitable imaging for the ducting and characterization of the tetropionyl mass. Entry displacement of tetropionyl organ strongly suggests that the tumor rise in the tetropionyl zone. The displacement of the tetropionyl vessels can be helpful. Pneumallocation, the first step is to decide whether the tumor is located within the tetropionyl space. It is useful to observe the displacement of the normal anatomical structure and the displacement of the tetropionyl mass strongly suggests that the tumor rise in the tetropionyl major vessels and some of their branches are also found in the tetropionyl cavity. So the displacement of their vessels can be helpful. Identification of the organ operation, some radiological signs that are helpful in determining tumor origin include the big sign, hand term, invisible organ sign, embedded organ sign and prominent feeding artery sign when there is no definitive sign that suggests the organ of the origin. The diagnosis primarily retrograde the tumor, become likely WH classification of the retrograde the tumor. Issue of origin in the neoplasm, number one fatty tissue like lipoma, lipoma, liposarcoma, vestibular tissue, lymphenema, malignant, mangiopericytoma, number five neurogenic tissue, neurofibroma, swanoma. Adariseritropatrial fibrosis, weak sign, when the mass deforms the age of the adjacent organ into a weak state, it is likely that the mass arrives from that organ. When a tumor comprises the organ that is not the organ of origin, the organ is deformed into a crescent shape. Prominent feeding artery sign, hypervascular mass are open supply by feeding artery that are prominent enough to visualize that CT. This finding provide an important key to understand the origin of the mass. Retro patent tumor, most retro patent tumor are mesotermaline origin and can arise from every tissue type present in the retro patent space. Retro patent sarcoma is about 90% of metrodermal primary retro patent malignancy. With liposarcoma, lyoma, sarcoma and malignant fibrosis, it is about more than 80% of these tumor. A large retro patent liposarcoma, liposarcoma is the most common retro patent sarcoma, first it is 30% of all sarcoma. It is usually a large diameter more than 20 cm and it is very slow growing tumor. Well-deprecated liposarcoma are more common. CT imaging show a round or low billet mass that may displace and surround local structure and demonstrate the CT at the end of the head. Fibrosarcoma, the fibrosarcoma is a collagen producing malignant tumor drawing from cancerous fibroblast. Multifocal sarcoma is tumor, it is kind of 40-year-old main demonstrate multiple mass, two of them are retro patent mass. Neurogenic tumor, neurogenic tumor is 10-20% of primary retro patent mass. Compared with the midgen primary tumor, they are kind of younger age group. Neuroblastoma is a malignant tumor that contains primitive neuroblast. Neuroblastoma is a 5-year-old male. Lymphoma is the most common malignant retro patent tumor. 33% of all malignant retro patent tumors. On imaging, it appears as well, well-defined polycystic homogenous mass with mild homogenous contrast on its end. It is typically made of the components of the endear that is spread between normal structure without compressing them. Retro patent husband lymphoma is a 28-year-old woman. Lymphadenopathy from metastatic malignancy. Common primary malignancy with a prediction for metastatic retropetal lymphadenopathy include RCC renal cell carcinoma, survival carcinoma, genetic urinary carcinoma, malignant mass of the retro patent organ, adenu gland. Malignant adenu gland tumor may include q-chromocytoma, which arrives from the chromathing cell of the adenu medulla, large adenu mass. 67-year-old woman with endometrial cancer, CCT demonstrated laboratory retrogens pararotic mass with extension to vertebral body. Results, most common tissue origin mutual tremel 41%, followed by neurogenic 23%. X-tragonadal 11% and lastly rare metastatic tumor 5%. So CT scan with contrast study are very helpful to identify retropetal masses and to locate the organ of tissue origin. Various radiological signs are helpful to identify origin of the retropetal masses. That's my references. Thank you.