Table 1

Basic patient and recurrent aneurysm characteristics

Aneurysm No	First coiling reason	Endovascular treatment times	Last implant time (months)*	Clipping reason	Location	Size/neck (mm)	Imaging findings	Type†
1	Headache	2	2	aSAH	AComA	13.3/4.5	Aneurysm growth	Ⅲ
2	Headache	2	2	aSAH	RMCA	12.2/4.2	Aneurysm growth	Ⅲ
3	aSAH	1	35	Recurrence	RMCA	4.3/2.2	Coil compaction	Ⅳ
4	Dizziness	1	6	Recurrence	PComA	25.0/8.4	Coil compaction	Ⅴ
5	aSAH	2	102	aSAH	RCA C7	8.2/4.5	None	Ⅴ
6	aSAH	1	7	Recurrence	AComA	5.2/2.4	Aneurysm growth	Ⅲ
7	aSAH	2	8	Recurrence	AComA	5.3/2.2	Coil compaction	Ⅲ
8	aSAH	1	71	aSAH	LCA C7	6.3/2.2	Aneurysm growth	Ⅲ
9	aSAH	2	111	aSAH	LCA C7	13.4/4.5	Aneurysm growth and coil compaction	IV

*Last implant time means the interval between the last endovascular treatment and clipping.
†The type of recurrent aneurysm is classified into the following five types: I, pure recanalization inside the aneurysm sac; II, pure coil compaction without aneurysm growth; III, new aneurysm neck formed without coil compaction; IV, new aneurysm neck formed with coil compaction; and V, newly formed aneurysm neck and sac. Types Ⅰ–Ⅱ can be resolved with endovascular treatment, whereas types Ⅲ–Ⅴ require surgical clipping.
AComA, anterior communicating artery; aSAH, aneurysmal subarachnoid hemorrhage; LCA C7, left carotid artery communicating segment; PComA, posterior communicating artery; RCA C7, right carotid artery communicating segment; RMCA, right middle cerebral artery.