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Table 1: Contrast-enhanced MR imaging findings of patients who underwent imaging within 7 days of an image-guided LP^{^a}
Subdural Collections Dural Enhancement Brain Sag Venous Distension
All patients 5.2% (8/153) 3.9% (6/153) 0.6% (1/159) 1.3% (2/158)
MR imaging <2 days of LP 2.5% (2/80) 0% (0/85) 0% (0/85) 2.4% (2/83)
Large-volume LP (>30 mL) 0% (0/6) 0% (0/6) 0% (0/6) 0% (0/6)
↵a Imaging findings present on pre-LP imaging were not included in this analysis.

	Subdural Collections	Dural Enhancement	Brain Sag	Venous Distension
All patients	5.2% (8/153)	3.9% (6/153)	0.6% (1/159)	1.3% (2/158)
MR imaging <2 days of LP	2.5% (2/80)	0% (0/85)	0% (0/85)	2.4% (2/83)
Large-volume LP (>30 mL)	0% (0/6)	0% (0/6)	0% (0/6)	0% (0/6)