Table 1 Clinical features of patients with pyriform sinus fistula

Age at the first episode (years)^#

10 (1–50)

8.5 (5–18)

15 (9.5–46)

n.s

Age at the first treatment at our institute (years)^#

16 (4–62)

14.5 (7–24)

35 (15–54.5)

*p = 0.011

Sex: Female/male

32/51

29/45

3/6

n.s

Laterality

 Left

76 (91.6)

68 (91.9)

8 (88.9)

n.s

 Right

6 (7.2)

5 (6.8)

1 (11.1)

 Bilateral

1 (1.2)

1 (1.4)

0 (0.0)

Number of inflammation episodes

 Once

31 (37.3)

30 (40.5)

1 (11.1)

n.s

 Twice

21 (25.3)

16 (21.6)

5 (55.6)

 ≥ 3

31 (37.3)

28 (37.8)

3 (33.3)

Clinical manifestations

 Abscess

47 (56.6)

44 (59.5)

3 (33.3)

n.s

 Reddish swelling

34 (41.0)

29 (39.2)

5 (55.6)

 Simple mass

2 (2.4)

1 (1.4)

1 (11.1)

History of incisional drainage

 None

45 (54.2)

40 (54.1)

5 (55.6)

 Once

25 (30.1)

23 (31.1)

2 (22.2)

n.s

 ≥ 2

13 (15.7)

11 (14.9)

2 (22.2)

 Previous fistulectomy

14 (16.9)

13 (17.6)

1 (11.1)

n.s