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Table 4: MR imaging features by tumor group after excluding pineoblastomas (n = 29)
Group P Value 
ET Non-ET All Patients
No. % No. % No. %
Size (cm) .95 
    Median 5.7 – 6.2 – 6.1 –
    Minimum 3.6 – 2.7 – 2.7 –
    Maximum 9.1 – 9.3 – 9.3 –
% Enhancement .68^{^a} 
    None 0 0 0 0 0 0
    0–25 2 20 3 15.8 5 17.2 
    25–75 5 50 7 36.8 12 41.4 
    >75 3 30 9 47.4 12 41.4 
Margins .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 .24^{^b} 
    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 .53 
    Absent 0 0 3 15.8 3 10.3
    Present 10 100 16 84.2 26 89.7 
Presence of calcification or hemorrhage .11 
    Absent 6 60 5 26.3 11 37.9
    Present 4 40 14 73.7 18 62.1 
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
Note:— – indicates no data available.
a Comparison of none versus 0%–25% versus 25%–75% versus >75%.
b Comparison of absent versus present.

	Group				P Value
	ET		Non-ET			All Patients
	No.	%	No.	%		No.	%
Size (cm)					.95
Median	5.7	–	6.2	–		6.1	–
Minimum	3.6	–	2.7	–		2.7	–
Maximum	9.1	–	9.3	–		9.3	–
% Enhancement					.68^{^a}
None	0	0	0	0		0	0
0–25	2	20	3	15.8	5	17.2
25–75	5	50	7	36.8	12	41.4
>75	3	30	9	47.4	12	41.4
Margins					.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					.24^{^b}
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					.53
Absent	0	0	3	15.8		3	10.3
Present	10	100	16	84.2	26	89.7
Presence of calcification or hemorrhage					.11
Absent	6	60	5	26.3		11	37.9
Present	4	40	14	73.7	18	62.1
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