How are coils introduced into an aneurysm during a coiling procedure?

In a coiling procedure, coils, also known as endovascular coils or embolization coils, are introduced into an aneurysm to promote clot formation and reduce blood flow within the aneurysm, ultimately preventing rupture. The correct answer reflects the approach of ensuring the stability of the mass of coils within the aneurysm.

During the procedure, multiple coils are deployed into the aneurysm until a secure and stable configuration is achieved. This stability is critical because it determines the effectiveness of the treatment in occluding the aneurysm and preventing further blood flow. The goal is to create a dense and well-organized mass of coils that fosters thrombus formation, sealing the aneurysm off from the rest of the vascular system.

Coils are not introduced one at a time without consideration of the overall mass, which would be less effective. Instead, the physician monitors the accumulation of coils and assesses the stability of the configuration as coils are added. This method ensures that the treatment is comprehensive and that the coils work synergistically to occlude the aneurysm effectively. Hence, introducing coils until a stable mass is formed aligns with best practices in endovascular treatment of aneurysms.