The relationship between postoperative radiological findings and surgical techniques applied.

Table 4: The relationship between postoperative radiological findings and surgical techniques applied.

		Surgery Technic
		Suboccipital cranioectomy without duraplasty		Suboccipital cranioectomy with duraplasty
		Number	Percentage	Number	Percentage	p
Clinical Improvement	Aggravated	0	0.0%	1	5.9%	0.094
	No improvement	0	0.0%	2	11.8%
	Slight improvement	14	50.0%	6	35.3%
	Complete improvement	14	50.0%	8	47.1%
Preoperative Sisterna Magna	None	25	86.2%	13	76.5%	0.443
Preoperative Sisterna Magna	Minimal	4	13.8%	4	23.5%	0.443
Postoperative Sisterna Magna	None	7	24.1%	1	5.9%	< 0.001
	Minimal	17	58.6%	3	17.6%
	Sufficient occured	5	17.2%	13	76.5%
Preoperative Obex	Not observed	19	65.5%	10	58.8%	0.65
Preoperative Obex	Observable	10	34.5%	7	41.2%	0.65
Postoperative Obex	Not observed	6	20.7%	1	5.9%	0.234
Postoperative Obex	Observable	23	79.3%	16	94.1%	0.234
Preoperative Syrinx		13	44.8%	9	52.9%	0.595
Postoperative MRI Syrinx Status	Better than before surgery	5^a	38.5	8^b	80	0.019
	Same	8^a	61.5	1^b	10
	Worse than before surgery	0^a	0	1^a	10