Table 2:

Eight patients who had subdural collections on MR imaging within 7 days after LP^{^a}

	Presenting Diagnosis/Reason for Procedure	Age (yr)	Days between LP and MR Imaging	CSF Removed (mL)	CSF Opening Pressure (cm H₂O)	Brain Sag	Venous Distension	Diffuse Dural Enhancement
Patient 1	Mycosis fungoides	35	4	9	NA	Yes	Yes	Yes
Patient 2	Leukemia	42	4	8	NA	No	Yes	Yes
Patient 3	AMS	54	3	16	NA	No	No	Yes
Patient 4	AMS	61	0	14	NA	No	No	No
Patient 5	Multiple myeloma	69	3	16	NA	No	No	Yes
Patient 6	Leukemia	69	1	6	NA	No	No	No
Patient 7	Pulmonary adenocarcinoma	69	6	15	13	No	No	Yes
Patient 8	AMS	71	4	14	14	No	No	Yes

Note:—NA indicates not available; AMS, altered mental status.
↵a None of the patients had a definite etiology on CSF analysis to explain dural enhancement. Each patient underwent an LP with a 22-ga Quincke tip spinal needle.