Table 3.

MRI features by tumor group (all patients n=56).

	Group				P	All Patients
	PBL/ET		Non-ET
	n	%	n	%		n	%
Size (in centimeters)					<0.001
Median	3.6	-	6.2	-		4.3	-
Minimum	1.1	-	2.7	-		1.1	-
Maximum	9.1	-	9.3	-		9.3	-
% Enhancement					0.17a 0.080b
None	1	2.7	0	0		1	1.8
0 to 25	3	8.1	3	15.8		6	10.7
25 to 75	6	16.2	7	36.8		13	23.2
>75	27	73.0	9	47.4		36	64.3
Margins					<0.001
Well-defined	37	100.0	13	68.4		50	89.3
Ill-defined	0	0	6	31.6		6	10.7
Presence of edema					<0.001c
Absent	32	86.5	5	26.3		37	66.1
<2 cm from tumor margin	4	10.8	13	68.4		17	30.4
>2 cm from tumor margin	1	2.7	1	5.3		2	3.6
Presence of cyst/necrosis					0.22
Absent	12	32.4	3	15.8		15	26.8
Present	25	67.6	16	84.2		41	73.2
Presence of calcification or hemorrhage					0.26	21	37.5
Absent	16	43.2	5	26.3		21	37.5
Present	21	56.8	14	73.7		35	62.5
Diffusion weighted imaging (DWI)					--
Bright	28	75.7	15	78.9		43	76.8
Dark	1	2.7	0	0		1	1.8
Intermediate	5	13.5	3	15.8		8	14.3
Artifact or not available	3	8.1	1	5.3		4	7.1
Metastasis
Intracranial	1	2.7	0	0		1	1.8
Spinal	5	13.5	0	0		5	8.9
Intracranial and spinal	6	16.2	0	0		6	10.7
None	25	67.6	19	100.0	--	44	78.6
All Patients	37	100.0	19	100.0		56	100.0

^acomparison of none vs. 0–25% vs. 25–75% vs. >75%

^bcomparison of >75% vs. ≤75%

^ccomparison of absent vs. present