Incidence of colorectal lesions in first degree relatives of patients with serrated polyposis syndrome.

Interventions: All eligble FDRs are invited to undergo a standard white light screening colonoscopy. Primary outcome(s): The incidence of CRC, adenoma detection rate (ADR) and presence of multiple (>2) proximal serrated polyps (HPs or SSAs). Study Design: N/A: single arm study, Open (masking not used), N/A , unknown, Factorial