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TABLE 2: Size and location of aneurysms
Location 
 Carotid n = 93 
  Petrous 6 
  Cavernous 25 
  Petrous/Cavernous 2 
  Ophthalmic 47 
  Other intracranial sites 13 
 Posterior circulation n = 7 
  Vertebral 1 
  Vertebrobasilar 1 
  Superior cerebellar 1 
  Posterior cerebral 2 
  Basilar tip 2 
Average aneurysm size (mm)^* 
Median Range
Dome height 15 4–40
Dome width 14 3–44
Neck width 7 1–25
Total Neck <4 mm Neck ≥4 mm Neck ≥4 mm or D:N <2
Aneurysm sac (mm) 
 Small (<10 mm) 21 6 15 18
 Large (10–25 mm) 60 3 57 57
 Giant (>25 mm) 19 0 19 19
n = 100^† 100 9 91 94
* 1 aneurysm nearly fusiform mc
† Includes 1 fusiform neck.

Location
Carotid n = 93
Petrous	6
Cavernous	25
Petrous/Cavernous	2
Ophthalmic	47
Other intracranial sites	13
Posterior circulation n = 7
Vertebral	1
Vertebrobasilar	1
Superior cerebellar	1
Posterior cerebral	2
Basilar tip	2
Average aneurysm size (mm)^*
	Median	Range
Dome height	15	4–40
Dome width	14	3–44
Neck width	7	1–25

	Total	Neck <4 mm	Neck ≥4 mm	Neck ≥4 mm or D:N <2
Aneurysm sac (mm)
Small (<10 mm)	21	6	15	18
Large (10–25 mm)	60	3	57	57
Giant (>25 mm)	19	0	19	19
n = 100^†	100	9	91	94