Table 1: Summary of patient data.

Pre-excision ECOG EA

Lesion

Post-excision ECOG EA

F/U

Patient

Age

Side

Pathology

F1

F2

F3

C

T

Surgery

excision

Border

Distant

Outcome

(years)

01

15

L

Oligodendroglioma

+

+

+

+

+

L&C

Complete*

C

IV

2

01r

17

L

Gliosis

nr

+

+

+

nr

ASL

Complete

B

III

5

02

28

R

Oligodendroglioma

+

-

-

-

-

ASL

Complete

-

-

I

7

03

25

R

Meningioma + gliosis

-

-

-

-

nr

L&C

Complete

-

-

I

17

04

17

R

Hamartoma

+

+

+

+

+

Lob

Incomplete**

D

IV

10

05

21

L

AVM

+

+

-

-

nr

L&C

Complete

-

-

I

12

06

26

L

Astrocytoma (low grade)

+

-

-

-

-

L&C

Complete

-

-

I

10

07

10

R

AVM

-

+

+

-

nr

L&C

Complete*

A

I

6

08

20

R

Astrocytoma (low grade)

+a

+a

+

-

+

Lob

Incomplete

-

-

III

5

09

27

L

Astrocytoma (low grade)

+

-

+

-

-

L&C

Incomplete*

C

III

3

10

19

L

Hamartoma

-

+

-

-

-

MD

Complete**

-

-

I

7

11

37

L

Oligodendroglioma

-

-

-

-

-

L&C

Complete

-

-

I

7

12

35

L

Mixed astrocytoma/oligodendroglioma

+

+

-

-

-

L&C

Complete**

-

-

I

8

13

57

L

Anaplastic astrocytoma

-

-

-

-

-

L&C

Incomplete

-

-

I

4

14

5

R

Tuberous sclerosis

+

+

+

+

+

ASL

Incomplete*

D

IV

7

15

30

L

Ganglioglioma

-

-

-

-

nr

L&C

Incomplete

-

-

III

2

16

8

R

Protoplasmic astrocytoma

+

+

+

+

nr

ASL

Complete

B

I

10

17

10

R

Tuberous sclerosis

-

+

+

-

-

L&C

Incomplete

-

-

IV

2

17r

12

R

Tuberous sclerosis

-

-

-

-

-

ASL

?Incomplete

No post

recording

IV

8

18

13

R

Tuberous sclerosis

-

+

+

-

-

L&C

Incomplete

B

III

3

18r

16

R

Tuberous sclerosis

-

+

nr

-

-

ASL

?Complete*

A

I

5

19

38

R

AVM

-

-

-

-

-

L&C

Complete

-

-

I

2

20

20

R

AVM

-

-

+

+

-

L&C + ct

Complete

-

-

I

1

21

30

R

Tuberous sclerosis

-

-

-

-

nr

L&C

Complete

-

-

I

1

22

25

L

Ganglioglioma

-

-

-

-

nr

L&C

Complete

No post

recording

I

1

aEA only after methohexital administration.

*Resection extended once because of post-excision ECOG.

**Resection extended twice because of post-excision ECOG.

A = spike frequency 6 spikes/minute; B = spike frequency > 6-12 spikes/minute; C = spike frequency > 12-24 spikes/minute; D = spike frequency >24 spikes/minute; F1, F2, F3, C, T = first frontal, second frontal, third frontal, central, temporal gyri, respectively; Lob = frontal lobectomy; ASL = anterior (subtotal) lobectomy; MD = mediodorsal resection; L&C = lesionectomy and corticectomy; ct = subpial cortical transection (central region); F/U = follow-up; r = re-operation; nr = no recording.

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Table 2:

A. Pre-excision EA and outcome.

Class I

Class III and IV

Total

EA three gyri

1

5

6

EA two gyri

14

5

19

Total

15

10

25

(p < 0.05)

B. Post-excision EA (distant to resection border) and outcome.

Class I

Class III and IV

Total

Distant EA

1

6

7

Absent

13

3

16

Total

14

9

23

(p < 0.01)

C. Completeness of lesion excision and outcome.

Class I

Class III and IV

Total

Complete

14

2

16

Incomplete

1

8

9

Total

15

10

25

(p < 0.001)

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Table 3:

A. Complete lesionectomy with no distant post-excision EA and outcome.

Class I

Class III and IV

Total

Complete resection + absent distant EA

12

0

12

Incomplete resection and/or distant EA

2

9

11

Total

14

9

23

(p < 0.00015)

B. Complete lesionectomy with pre-excision EA from 2 gyri and outcome.

Class I

Class III and IV

Total

Complete resection + EA 2 gyri

13

0

13

Incomplete resection and/or EA 3 gyri

2

10

12

Total

15

10

25

(p < 0.00005)

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