The Mistakes in polypectomy article discusses the best practice in colorectal polypectomy, which can guide training priorities among trainees and established endoscopic practitioners. The quality of polypectomy, the complete resection of polyps, plays a role in emphasizing the preventive effects of the procedure.

Crohn’s disease (CD) is a chronic inflammatory bowel condition that can present with a wide range of intestinal and extra-intestinal manifestations. This condition can develop at any age and have a significant impact and impairment on quality of life for individuals including on relationships, educational attainment and work productivity. In particular, the time around and after diagnosis often involves the most upheaval for patients, and equally the biggest opportunity for effective intervention. Several recent advances have had a major impact on optimal management of patients with newly diagnosed CD. Here, we discuss the mistakes that are commonly made when managing patients presenting with a new diagnosis of CD. We summarise the evidence base and offer helpful and pragmatic tips for practising clinicians.

Barrett’s oesophagus is the precursor to oesophageal adenocarcinoma, which carries a poor prognosis, and it is likely that all endoscopists and gastroenterologists will encounter Barrett’s oesophagus in their clinical practice. Careful assessment and management of patients who have Barrett’s oesophagus with endoscopic surveillance and endoscopic endotherapy aim to reduce the risk of progression to invasive adenocarcinoma. Advances in endoscopic diagnosis and therapy should, therefore, help to reduce the risk of progression. As with all premalignant conditions and surveillance programmes, careful multidisciplinary management of the patient is important to reduce the risk of causing them to become unduly concerned. Here, we present some mistakes that in our experience are commonly made in the endoscopic diagnosis and management of Barrett’s oesophagus and give advice on how to avoid them.