Summary: There are many overlapping classifications for bowel polyps. Geir Hoff, professor of gastroenterology at the University of Oslo, explains why he fears screening for one type has lead to overtreatment of another. Also, Sophie Wilne, consultant paediatric oncologist at Nottingham University Hospitals NHS Trust, discusses the clinical signs of brain tumours in children and young adults, and what treatment should follow. See also: Identifying brain tumours in children and young adults www.bmj.com/content/347/bmj.f5844 New polyps, old tricks: controversy about removing benign bowel lesions <p>www.bmj.com/content/347/bmj.f5843</p>
