Clinical characteristics and prognosis of patients with ulcerative colitis that shows rectal sparing at initial diagnosis

Table 1 Clinical characteristics of rectal sparing ulcerative colitis at diagnosis

	Rectal spring UC at diagnosis (n = 24)
Age (yr)	35.8 ± 11.0
Sex (male:female)	19:5
Disease distribution
Extensive colitis (E3) with rectal sparing	16 (66.7%)
Left-sided colon (E2) with rectal sparing	8 (33.3%)
Initial Diagnosis
IBD-U	8 (33.3%)
Infectious colitis	7 (29.2%)
UC	7 (29.2%)
Nonspecific	2 (8.3%)
Symptom duration	2 mo (2 wk to 60 mo)
Laboratory findings
WBC (count/mm3)	6475.9 ± 2273.4
ESR (mm/h)	17.4 ± 13.9
CRP (mg/dL)	0.4 ± 0.7
p-ANCA positive	4 (16.7%)
Follow-up endoscopy (follow-up period median 9 yr, 5-15 yr)
Persistence of rectal sparing	2 (8.3%)
Appearance of proctitis	22 (91.7%)

UC: Ulcerative colitis; IBD: Inflammatory bowel disease; ESR: Erythrocyte sedimentation rate; CRP: C-reactive protein; ANCA: Anti-neutrophil cytoplasmic antibodies; WBC: White blood cell.