Giant intracranial aneurysms (GIAs) pose a formidable challenge in cerebrovascular surgery. Despite remarkable advancements in microsurgical techniques, the associated morbidity and mortality rates remain alarmingly high, reaching up to 20%. The three-dimensional (3D) Slicer emerges as a valuable tool, offering sophisticated medical image visualization and analysis capabilities. This article reports on a captivating case where 3D Slicer technology played a pivotal role in diagnosing GIA. The 3D slicer excels in assisting with surgical procedures like clipping and resection of both regular and giant thrombotic aneurysms. Its intuitive interface and advanced functionalities hold immense promise for revolutionizing the diagnosis and management of these challenging lesions.