Giant intracranial aneurysm is defined as the one larger than 2.5 cm in diameter Giant anemysms represent 2% to 5% of all intracranial aneurysms. Most patients who become symptomatic in the fourth through Sixth decades of life are found in all locations; 5-18 % of them presented in middle cerebral artery (MCA morphology of giant anemysms can be either fusiform or saccular.Significant proportion of giant anemysms has been associated with intraluminal thrombosis. As many as 60% in some series may initially be evaluated for SAH, signs and symptoms related to a mass effect develop in approximately two thirds. Mass effect can be manifested as pain, visual field and acuity defects, and extra ocular dysfunction. Dementia and mental disturbances, as well as hemiparesis and ep ilepsy, have also been described Current treatment options for these lesions include direct surgical techniques, endovascular techniques, and combined approaches. Indirect surgical techniques include proximal occlusion and trapping of the aneurysm using clips or ligature above and below the lesion. If the patient is unable to tolerate occlusion of the parent vessel in relation to a giant aneurysm, an extracranial to intracranial bypass procedure can be performed with subsequent trapping or proximal occlusion of the vessel A 32 year old woman presented with acute severe headache and mild hemiparesis in emergency ward. Her brain CT scan showed sub arachnoid hemorrhage with giant right temporal mass effect Brain MRI and angiography showed partial thrombosed giant aneurysm without visible neck The patient was checked in supine position and slight head rotation and extension. Curvilinear right incision, then pterional craniotomy was done and then dura was opened. After that, brain relaxed with csf drainage.Sylvain cistern was opened widely.then with intermittent proximal control neck dissection was done and clipping with ADVANCEd clipping (creeping) was done little by little and then after the removal of temporary clip, the aneurysm wall and clot was resected and then the papaverin used Patient was recovered and post-operative CT angiography showed any residue or vessel compromise