Table 3:

MR imaging features by tumor group (all patients, n = 56)

	Group				P Value	All Patients
	PBL/ET		Non-ET
	No.	%	No.	%		No.	%
Size (cm)					<.001
Median	3.6	–	6.2	–		4.3	–
Minimum	1.1	–	2.7	–		1.1	–
Maximum	9.1	–	9.3	–		9.3	–
% Enhancement					.17a, .080b
None	1	2.7	0	0		1	1.8
0–25	3	8.1	3	15.8		6	10.7
25–75	6	16.2	7	36.8		13	23.2
>75	27	73.0	9	47.4		36	64.3
Margins					<.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					<.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					.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					.26
Absent	16	43.2	5	26.3		21	37.5
Present	21	56.8	14	73.7		35	62.5
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

Note:—– indicates no data available.

^aComparison of none versus 0%–25% versus 25%–75% versus >75%.

^bComparison of >75% versus ≤75%.

^cComparison of absent versus present.