In which of the following conditions pseudopolyps are seen?
Crohn's disease
Ulcerative colitis
Celiac disease
Tropical sprue
Islands of regenerating mucosa called pseudopolyps can be seen in ulcerative colitis. These are seen during a quiescent phase of ulcerative colitis and are a later manifestation of this condition. Ref: Robbin's 7th edition page 851, Harrison's Internal Medicine 17th edition chapter 26 ; Colon and Rectal Surgery, 5e By Marvin L. Corman, 2005, Page 1330.