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¹Hacettepe Üniversitesi, Tıp Fakültesi, Beyin ve Sinir Cerrahisi Anabilim Dalı, Ankara, Türkiye Approximately 5% of intracranial aneurysms are larger than 2.5 cm and are called "giant aneurysms". In cases with giant aneurysms, angiographic images must be supported by magnetic resonance imaging or computed tomography to learn the true dimensions of the aneurysm. In the surgical treatment of aneurysms, maximum opening of the Sylvian fissure and minimal brain retraction are essential. Although giant aneurysms appear to be impossible to clip at the beginning of angiography or even during the surgical exploration, most of these aneurysms can be clipped by experience, patience and advanced microsurgical techniques. Intraoperative angiography provides a significant advantage in the surgeries of these aneurysms. Surgical clipping is still the safest and most reliable way to treat giant aneurysms. Anahtar Kelimeler : Giant aneurysm, Surgical treatment