 Good afternoon. I'm Dr. Milap Kamal Singh, third year radiology post graduate resident from Subharti Medical College. My paper topic for my paper presentation is imaging in non-traumatic sub-required hemorrhage objectives of the study to determine the role of CT angiography in evaluation of sub-required hemorrhage in non-traumatic patients. To determine the cause and location of lead, to determine the concordance between the surgical findings and CT angiographic findings and production. Non-traumatic sub-required hemorrhage accounts for 3 to 5% of all strokes. Approximately 80% of these are caused by ruptured intra-pano-sacral aneurysms and fusiform, which are rare. CT angiography is recommended as first choice because of its fast scanning speed and convenience. CT angiography has a reported sensitivity of 97 to 100% for detection of intra-pano-sacral aneurysms. Accurate evaluation of the morphologic features of cerebral aneurysms and the associated circulation is critical for selection and optimization of the endovascular and surgical technique. Materials and methods. It is a prospective observational study done with 50 patients. The study period was from October 2022, October 2022. All patients of any age group refer to the radiology department with clinical suspicion of non-traumatic sub-required hemorrhage. All patients of any age group with incidental finding of aneurysms and CT angiography. Image acquisition protocol. All the study was done on CT, all the study was done on Philips 128 slides and these were the complications used. Results. CT brain angiography revealed aneurysms in 37 patients out of 50 patients. A's distribution were 72% below 55 and 28% above 55. Gender distribution was 77% in female, which were more than male. There were 43% type of aneurysms. Those 40 aneurysms, 38 were secular and 2 were fusiform. Location of aneurysms. Most commonly the aneurysm was found in MCA and ICA, which were 10 and in AC over 9 and ACOM were 5. In BESLA were 4 and in PC and PCOM were 3. CT angiography revealed 40 aneurysms in 37 patients and does not reveal the source of bleeding in 13 patients. Most of the aneurysms were identified at bifurcation and bifurcations and 10 were identified of internal carotid artery. 10 were identified at middle cerebral artery and 9 were identified at anterior cerebral artery. Few of them identified in the branches of BESLA artery and 2 were BESLA top aneurysms. One of them was at the clenoid segment of internal cerebral artery measuring 18 into 13 mm and 15 into 15 mm at middle cerebral artery. CT angiography also revealed additional findings. Two patients showed AVM malformations and one of the patients showed a large aneurysm. 13 patients underwent clipping and the concordance between the radiological findings and intraoperative findings were 97%. Two of them showed small blebs in the internal cerebral artery and middle cerebral artery, which was not found on CT angiography. These are a few examples. On the right side, we can see a large intraperoncammal hematoma in the right temporal lobe with several at right hemorrhage in the central spaces. And on the left side, there's a 3D reconstructed image showing a trilobed aneurysm at the clenoid portion of the right cerebral artery. And then another patient, we can see the non-enhanced axial plane CT scan, we can see a well-defined rounded area of hyperdensity in the right. In the supercellular region on the right side, and on CT angio, we can see a focal contrast field aneurysm outpatching with neck of 3.4 mm. And on the coronal section, we can see the tip projecting superior medley is noted arising from the C5 segment of IC on the right side. And we can see a blood-adverting hyperdensity in the basal system on the right side. And another patient, we can see the hyperdensity in the lab-cellular fissure in the centurum cerebelli, intra-hobsteric fissure. And on the CT angio, we can see a secular aneurysm arising from the supracrylonoid segment of left ICA. And another patient, we can see a well-defined rounded contrast field outpatching noted arising from the supracrylonoid portion of left. On the right, in the M1 segment of MCA. And the few section below, we can see another aneurysm arising from the left ICA, which we can also see on the coronal image. And this was diagnosed as a fusiform aneurysm discussion. CT angiography of brain proved to be an excellent tool in the diagnosis of aneurysms in patients with sub-required hemorrhage. In this study, CT angio reached 100% specificity and 98% sensitivity. Another advantage of CT angiography of brain was amount of additional information acquired that might be helpful in neurosurgical intervention. Information such as the distance from the vessels to the skull, base, or clonoid process. It's ability to obtain various projections using 3D CT aries constructions in the MIP and demonstrating the neck shape and orientation of the aneurysms. CT angiography of brain thus provides valuable additional information prior to the possible therapeutic intervention. These were the references for which I prepared my paper. Thank you.