Table 4.

MRI features by tumor group after excluding pineoblastomas (n=29).

	Group				p	All Patients
	ET		Non-ET
	n	%	n	%		n	%
Size (in centimeters)					0.95
Median	5.7	-	6.2	-		6.1	-
Minimum	3.6	-	2.7	-		2.7	-
Maximum	9.1	-	9.3	-		9.3	-
% Enhancement					0.68a
None	0	0	0	0		0	0
0 to 25	2	20	3	15.8		5	17.2
25 to 75	5	50	7	36.8		12	41.4
>75	3	30	9	47.4		12	41.4
Margins					0.068
Well-defined	10	100.0	13	68.4		23	79.3
Ill-defined	0	0	6	31.6		6	20.7
Presence of edema					0.24b
Absent	5	50	5	26.3		10	34.5
<2 cm from tumor margin	4	40	13	68.4		17	58.6
>2 cm from tumor margin	1	10	1	5.3		2	6.9
Presence of cyst/necrosis					0.53
Absent	0	0	3	15.8		3	10.3
Present	10	100	16	84.2		26	89.7
Presence of calcification or hemorrhage					0.11
Absent	6	60	5	26.3		11	37.9
Present	4	40	14	73.7		18	62.1
Diffusion weighted imaging (DWI)					--
Bright	9	90	15	78.9		24	82.8
Dark	0	0	0	0		0	0
Intermediate	0	0	3	15.8		3	10.3
Artifact or not available	1	10	1	5.3		2	6.9
Metastasis
Intracranial	0	0	0	0		0	0
Spinal	0	0	0	0		0	0
Intracranial and spinal	0	0	0	0		0	0
None	10	100	19	100.0		29	100
All Patients	10	100.0	19	100.0		29	100.0

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

^bcomparison of absent vs. present