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. 2016 Mar 23;158:981–988. doi: 10.1007/s00701-016-2777-5

Table 2.

Increase in height and width of the dural sac after the surgery: comparison of preoperative supine MRI with postoperative supine and prone MRI

		Preoperative supine MRI (n = 20)	Postoperative supine MRI (n = 9)	Postoperative prone MRI (n = 20)
Radiologist 1 (R.B.)	Mean height in mm (±SD)	11.7 (±2.1)	15.7 (±2.8) 3.2 (±1.5)^a <0.001^b	12.8 (±2.8) 1.1 (±2.5)^a 0.065^b
Radiologist 1 (R.B.)	Mean width in mm (±SD)	9.0 (±1.9)	12.8 (±2.3) 3.9 (±3.2) ^a 0.006^b	12.5 (±3.4) 3.5 (±3.3)^a <0.001^b
Radiologist 2 (M.G.)	Mean height in mm (±SD)	11.4 (±2.3)	16.1 (±2.3) 4.4 (±2.2)^a <0.001^b	13.7 (±3.0) 2.3 (±3.0)^a 0.004^b
Radiologist 2 (M.G.)	Mean width in mm (±SD)	9.0 (±1.6)	12.8 (±2.3) 4.1 (±2.3)^a <0.001^b	12.1 (±2.8) 3.1 (±2.7)^a <0.001^b

Statistics: paired t-test

n number of patients, mm millimetres, SD standard deviation

^aMean increase compared to preoperative MRI (mean of paired differences)

^b P value for comparison with preoperative MRI