A benign colorectal lesion with amorphous pit (Kudo Vn) and avascular pattern (Sano’s 3b): differential diagnosis with deep invasive adenocarcinoma - Testu, Sophie; Morin, Clémence; Rivory, Jérôme; Fabritius, Martin; Saurin, Jean-Christophe; Ponchon, Thierry; Pioche, Mathieu (Endoscopy, 2017)