Table 1 Patient characteristics, treatment, pathological results, and immunohistochemical test results

Sex

Male

8

72.7

Female

3

27.3

Age

< 18

1

9.1

≥ 18

10

90.9

Auxiliary examination(B-ultrasound or CT)

The appendix was slightly thickened

2

18.2

Acute appendicitis with fecal calculus

2

18.2

Acute appendicitis with fecal stone and peripheral exudation

1

9.1

Acute appendicitis with peripheral exudation

3

27.3

Acute appendicitis with perforation and peripheral exudation

1

9.1

The possibility of inflammatory changes in appendicitis

1

9.1

Surgical procedure

Open appendicectomy

8

72.7

Appendicectomy + right-sided hemicolectomy

1

9.1

Laparoscopic appendectomy

2

18.2

Size

< 1 cm

9

81.8

1–2 cm

2

18.2

> 2 cm

0

0.0

Extension

Distal

8

72.7

Body

3

27.3

Proximal

0

0.0

Tumor localization

Mucosal layer

1

9.1

Muscularis

6

54.5

Serous layer

4

36.4

Immunohistochemistry

NSE(+)

9

100

CgA(+)

9

100

Syn(+)

9

100

Ki 67%

> 1%

0

0.0

< 1%

9

100

Mesoappendix invasion

> 3 mm

0

0.0

< 3 mm

11

100

Vascular invasion

Yes

0

0.0

No

11

100

Lymphatic invasion

Yes

0

0.0

No

11

100

Perineural invasion

Yes

0

0.0

No

11

100

Positive resection margin

Yes

1

9.1

No

10

90.9