Role of intestinal ultrasound in ulcerative colitis: A systematic review

Table 12 Summary of studies on transperianal ultrasound in ulcerative colitis

Ref.	Study type	Number of patients	Follow-up duration	Comparator	USG parameters	Results
Sagami et al[57]	Cross-sectional	55 UC	Cross-sectional	Endoscopy, Histopathology	BWT, CDS, BWS	BWT ≤ 4 MM predicts endoscopic healing (MES ≤ 1), AUC = 0.904. BWT ≤ 4 MM predicts rectal histologic mucosal healing, AUC = 0.869. Better than FCP
Sagami et al[78]	Prospective, single centre	100 UC	Cross-sectional	FCP, CRP	BWT, CDS	Rectal ΔBWT at 1 wk predicted remission at 8 wk (odds ratio for 1 mm increase is 1.9); FCP did not predict remission

MES: Mayo endoscopic score; UC: Ulcerative colitis; FCP: Fecal calprotectin; CRP: C- reactive protein; BWT: Bowel wall thickness; CDS: Color Doppler signal; AUC: Area under the curve; BWS: Bowel wall stratification.