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Table 2 Patient characteristics

From: Schwannoma of the colon and rectum: a systematic literature review

Characteristics
Number 95
Age 61.2 years, range 14–95, median 64 years
Sex
 Male 40 (41.7%)
 Female 56 (58.3%)
Presenting symptom
 Asymptomatic 27 (28.1%)
 Rectal bleeding 22 (22.9%)
 Fecal occult blood 8 (8.3%)
 Abdominal pain 15 (15.6%)
 Constipation 7 (7.3%)
 Tenesmus 7 (7.3%)
Abdominal girth 2 (2.1%)
 NA 14 (14.6%)
Location
 Cecum and right colon 29 (30.2%)
 Transverse colon 5 (5.2%)
 Sigmoid 27 (28.1%)
 Left colon 8 (8.3%)
 Rectum 21 (21.9%)
 Appendix 1 (1%)
 NS 5 (5.2%)
Colonoscopy 73 (76%)
 Smooth submucosal mass 41 (56.2%)
 Ulcerated submucosal mass 5 (6.8%)
 Submucosal polyp 15 (20.5%)
 Intraluminal mass 6 (8.2%)
 Polypoid 3 (4.1%)
 Others 3 (4.1%)
Imaging 46 (48%)
 CT-SCAN 35 (76%)
  Well circumscribed 13 (37.1%)
  Homogenous enhancement 12 (34.3%)
  Central necrosis 1 (1%)
 EUS: hypo-echoic mass 7 (7.3%)
 FDG-PET 4 (4.2%)
 Hyper 3 (3.1%)
 Size (cm) 3.78 cm, range 0.3–28, median 3 cm
Diagnosis
 Endoscopy 23 (24%)
 Post-surgery 71 (74%)
Type of surgery
 Laparoscopic 11 (11.5%)
 Open 58 (60.4%)
 Endoscopic 15 (15.6%)
 Transanal 7 (7.3%)
 NA 5 (5.2%)
Extent of surgery
 Classical segmental 65 (67.7%)
 Wedge 3 (3.1%)
 Endo-luminal 23 (24%)
Tumor markers
 S100 94 (97.9%)
 Vimentin 13 (13.5%)
 GFAP 5 (5.2%)
 CD-34 2 (2.1%)
 CD-68 1 (1%)
Antonini type 26 (27.1%)
 A 15 (57.7%)
 B 6 (23.1%)
 A, B 5 (19.2%)
Mitosis
 Ki-67% 5 (5.2%)
 MIB-1 6 (6.3%)
 Low mitosis 30 (31.3%), mean 2.1/50, median 1/50
 NA 55 (57.3%)
LN
 NA 85 (88.5%)
 Negative 11 (11.5%)
Aggressiveness  
 Benign 93 (96.9%)
 Malignant 3 (3.1%)