Aneurysms can also be classified by their macroscopic shape and size and are described as either saccular or fusiform.
The shape of an aneurysm is not specific for a specific disease.
The size of the base or neck is useful in determining the chance of for example endovascular coiling.

Saccular aneurysms are spherical in shape and involve only a portion of the vessel wall; they vary in size from 5 to 20 cm (2.0 to 7.9 in) in diameter, and are often filled, either partially or fully, by a thrombus.

Fusiform aneurysms ("spindle-shaped" aneurysms) are variable in both their diameter and length; their diameters can extend up to 20 cm (7.9 in).
They often involve large portions of the ascending and transverse aortic arch, the abdominal aorta, or less frequently the iliac arteries.
Aneurysms can also be classified by their macroscopic shape and size and are described as either saccular or fusiform. The shape of an aneurysm is not specific for a specific disease. The size of the base or neck is useful in determining the chance of for example endovascular coiling.
Saccular aneurysms are spherical in shape and involve only a portion of the vessel wall; they vary in size from 5 to 20 cm (2.0 to 7.9 in) in diameter, and are often filled, either partially or fully, by a thrombus.
Fusiform aneurysms ("spindle-shaped" aneurysms) are variable in both their diameter and length; their diameters can extend up to 20 cm (7.9 in). They often involve large portions of the ascending and transverse aortic arch, the abdominal aorta, or less frequently the iliac arteries.
Aneurysm