Pseudopolyps in inflammatory bowel diseases: Have we learned enough?

Table 1 Prevalence of pseudopolyps in inflammatory bowel disease

Ref.	Year of publication	IBD diagnosis	Prevalence of pseudopolyps	Special characteristics
Bargen et al[29]	1929	UC (n = 693)	10.0%
Baars et al[30]	2012	UC (n = 171)	30.0%	44% of UC patients and 30% of CD patients with unknown status for PP
		CD (n = 77)	38.0%
Baars et al[31]	2012	UC, CD (n = 152)	20.0%
Bacon et al[32]	1956	UC (n = 84)	57.1%	Colectomy specimens
Bockus et al[27]	1956	UC (n = 125)	74.0%	Hospitalized patients
Chang et al[21]	2007	CD (n = 23)	22.0%	Examined only small intestine
Chawla et al[26]	1990	UC (n = 50)	4.0%
Chuttani et al[33]	1967	UC (n = 46)	15.0%
De Dombal et al[17]	1966	UC (n = 465)	12.5%
De Felice et al[19]	2015	CD (n = 24)	4.0%	Location esophagus
Dukes et al[11]	1954	UC (n = 120)	10.0%	Colectomy specimens
Edwards et al[34]	1964	UC (n = 624)	14.9%
Geboes et al[39]	1975	CD (n = 43)	16.0%
Jalan et al[10]	1969	UC (n = 399)	18.7%
Kelly et al[6]	1987	UC, CD (n = 86)	UC: 36%	Colectomy specimens
			CD: 17%
			GPP: 4.6%
Lescut et al[35]	1993	CD (n = 20)	10.0%	Only small intestine examined as location
Luo et al[36]	2009	UC, CD (n = 34)	29.0%	Pediatric population
Maroo et al[37]	1974	UC (n = 122)	8.0%
Modigliani et al[50]	1990	CD (n = 142)	41.0%	Active colonic or ileocolonic CD
Ray et al[38]	2011	UC (n = 40)	27.0%
Rutter et al[44]	2004	UC (n = 136)	39.0%	Control population without CRC Population with CRC
Tandon et al[40]	1965	UC (n = 69)	17.6%
Teague et al[41]	1975	UC (n = 150)	17.0%
Teh et al[42]	1987	UC (n = 61)	21.3%
Velayos et al[43]	2006	UC (n = 188)	42.0%	Control population without CRC Population with CRC
		UC (n = 188)	56.0%
Wang et al[45]	2007	UC (n = 2726)	22.0%	Active UC
Watts et al[46]	1966	UC (n = 169)	47.0%	Surgical specimens
Waugh et al[47]	1964	UC (n = 205)	5.9%	Surgical specimens
Wright et al[48]	1965	UC (n = 269)	10.0%
Zheng et al[49]	2007	CD (n = 27)	48.0%

CD: Crohn's disease; CRC: Colorectal cancer; IBD: Inflammatory bowel disease; UC: Ulcerative colitis.