Table 1. Open in new tab Clinical and...

Patients

Age, years

Gender

Smoking

Comorbidities

History of anal surgery

Park’s classification

Horseshoe-like fistula

Associated abscess

Internal opening location

Internal opening height, cm

Multiple tracts

The width of the tract crossing the external sphincter, cm

The length of the intersphincteric fistulous tract, cm

The interoperative methylene blue and hydrogen

Male

Yes

None

Yes

High transsphincteric

None

Ischioanal

2.2

None

0.5

1.1

N/A

Female

Yes

None

Low transsphincteric

Intersphincteric

None

1.5

Intersphincteric horseshoe-like fistula

0.4

3.1

N/A

Male

Yes

None

High transsphincteric

None

2.1

None

0.4

0.6

Blue-dyed

Female

None

Low transsphincteric + high intersphincteric

Intersphincteric

Ischioanal

2.3

Intersphincteric horseshoe-like fistula + rectal intermuscular

0.5

3.9

Blue-dyed

Male

None

High transsphincteric

Intersphincteric-ischioanal

Ischioanal

3.4

Intersphincteric horseshoe-like fistula

0.5

3.2

Blue-dyed

Male

None

Yes

Suprasphincteric

None

3.7

Supra-levator fistula

0.8

5.4

N/A

Male

None

Yes

High transsphincteric

Classical ischioanal

Intersphincteric

2.1

Ischioanal

1.2

3.0

Blue-dyed

Male

None

High transsphincteric

None

Intersphincteric

3.6

None

1.0

2.3

Blue-dyed

Male

None

Yes

High transsphincteric

None

Intersphincteric-ischioanal

2.0

Ischioanal fistula

1.1

1.0

N/A

Male

None

Yes

Low transsphincteric

None

2.3

None

0.6

1.0

Blue-dyed

Male

Yes

None

High transsphincteric

Intersphincteric-ischioanal

None

3.1

High intersphincteric-ischioanal horseshoe-like fistula

0.8

3.4

N/A

Male

None

Suprasphincteric

Intersphincteric-ischioanal

None

2.9

Inter-puborectalis muscle horseshoe-like fistula

0.7

2.6

N/A

Male

Yes

None

Yes

Suprasphincteric

None

Inter-levator

3.5

Inter-levator ani muscular

1.4

4.5

N/A

Male

None

Diabetes mellitus

Yes

Suprasphincteric

Intersphincteric

None

1.9

Inter-levator ani muscular + ischioanal

0.8

2.0

Blue-dyed

Male

None

Yes

High transsphincteric

Intersphincteric-ischioanal

Ischioanal

2.5

Inter-puborectal muscle horseshoe-like fistula

1.4

3.4

N/A

Table 1.

Open in new tab

Clinical and demographic characteristics of the patients

Patients	Age, years	Gender	Smoking	Comorbidities	History of anal surgery	Park’s classification	Horseshoe-like fistula	Associated abscess	Internal opening location	Internal opening height, cm	Multiple tracts	The width of the tract crossing the external sphincter, cm	The length of the intersphincteric fistulous tract, cm	The interoperative methylene blue and hydrogen
1	30	Male	Yes	None	Yes	High transsphincteric	None	Ischioanal	6	2.2	None	0.5	1.1	N/A
2	30	Female	Yes	None	None	Low transsphincteric	Intersphincteric	None	12	1.5	Intersphincteric horseshoe-like fistula	0.4	3.1	N/A
3	36	Male	Yes	None	None	High transsphincteric	None	None	6	2.1	None	0.4	0.6	Blue-dyed
4	31	Female	None	None	None	Low transsphincteric + high intersphincteric	Intersphincteric	Ischioanal	7	2.3	Intersphincteric horseshoe-like fistula + rectal intermuscular	0.5	3.9	Blue-dyed
5	31	Male	None	None	None	High transsphincteric	Intersphincteric-ischioanal	Ischioanal	6	3.4	Intersphincteric horseshoe-like fistula	0.5	3.2	Blue-dyed
6	33	Male	None	None	Yes	Suprasphincteric	None	None	6	3.7	Supra-levator fistula	0.8	5.4	N/A
7	28	Male	None	None	Yes	High transsphincteric	Classical ischioanal	Intersphincteric	6	2.1	Ischioanal	1.2	3.0	Blue-dyed
8	32	Male	None	None	None	High transsphincteric	None	Intersphincteric	6	3.6	None	1.0	2.3	Blue-dyed
9	66	Male	None	None	Yes	High transsphincteric	None	Intersphincteric-ischioanal	6	2.0	Ischioanal fistula	1.1	1.0	N/A
10	40	Male	None	None	Yes	Low transsphincteric	None	None	6	2.3	None	0.6	1.0	Blue-dyed
11	44	Male	Yes	None	None	High transsphincteric	Intersphincteric-ischioanal	None	7	3.1	High intersphincteric-ischioanal horseshoe-like fistula	0.8	3.4	N/A
12	40	Male	None	None	None	Suprasphincteric	Intersphincteric-ischioanal	None	6	2.9	Inter-puborectalis muscle horseshoe-like fistula	0.7	2.6	N/A
13	48	Male	Yes	None	Yes	Suprasphincteric	None	Inter-levator	7	3.5	Inter-levator ani muscular	1.4	4.5	N/A
14	68	Male	None	Diabetes mellitus	Yes	Suprasphincteric	Intersphincteric	None	6	1.9	Inter-levator ani muscular + ischioanal	0.8	2.0	Blue-dyed
15	33	Male	None	None	Yes	High transsphincteric	Intersphincteric-ischioanal	Ischioanal	6	2.5	Inter-puborectal muscle horseshoe-like fistula	1.4	3.4	N/A

Patients	Age, years	Gender	Smoking	Comorbidities	History of anal surgery	Park’s classification	Horseshoe-like fistula	Associated abscess	Internal opening location	Internal opening height, cm	Multiple tracts	The width of the tract crossing the external sphincter, cm	The length of the intersphincteric fistulous tract, cm	The interoperative methylene blue and hydrogen
1	30	Male	Yes	None	Yes	High transsphincteric	None	Ischioanal	6	2.2	None	0.5	1.1	N/A
2	30	Female	Yes	None	None	Low transsphincteric	Intersphincteric	None	12	1.5	Intersphincteric horseshoe-like fistula	0.4	3.1	N/A
3	36	Male	Yes	None	None	High transsphincteric	None	None	6	2.1	None	0.4	0.6	Blue-dyed
4	31	Female	None	None	None	Low transsphincteric + high intersphincteric	Intersphincteric	Ischioanal	7	2.3	Intersphincteric horseshoe-like fistula + rectal intermuscular	0.5	3.9	Blue-dyed
5	31	Male	None	None	None	High transsphincteric	Intersphincteric-ischioanal	Ischioanal	6	3.4	Intersphincteric horseshoe-like fistula	0.5	3.2	Blue-dyed
6	33	Male	None	None	Yes	Suprasphincteric	None	None	6	3.7	Supra-levator fistula	0.8	5.4	N/A
7	28	Male	None	None	Yes	High transsphincteric	Classical ischioanal	Intersphincteric	6	2.1	Ischioanal	1.2	3.0	Blue-dyed
8	32	Male	None	None	None	High transsphincteric	None	Intersphincteric	6	3.6	None	1.0	2.3	Blue-dyed
9	66	Male	None	None	Yes	High transsphincteric	None	Intersphincteric-ischioanal	6	2.0	Ischioanal fistula	1.1	1.0	N/A
10	40	Male	None	None	Yes	Low transsphincteric	None	None	6	2.3	None	0.6	1.0	Blue-dyed
11	44	Male	Yes	None	None	High transsphincteric	Intersphincteric-ischioanal	None	7	3.1	High intersphincteric-ischioanal horseshoe-like fistula	0.8	3.4	N/A
12	40	Male	None	None	None	Suprasphincteric	Intersphincteric-ischioanal	None	6	2.9	Inter-puborectalis muscle horseshoe-like fistula	0.7	2.6	N/A
13	48	Male	Yes	None	Yes	Suprasphincteric	None	Inter-levator	7	3.5	Inter-levator ani muscular	1.4	4.5	N/A
14	68	Male	None	Diabetes mellitus	Yes	Suprasphincteric	Intersphincteric	None	6	1.9	Inter-levator ani muscular + ischioanal	0.8	2.0	Blue-dyed
15	33	Male	None	None	Yes	High transsphincteric	Intersphincteric-ischioanal	Ischioanal	6	2.5	Inter-puborectal muscle horseshoe-like fistula	1.4	3.4	N/A

N/A = methylene blue staining was negative.

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