This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1111/jce.14106. This article is protected by copyright. All rights reserved. Accepted Article Robert Anderson ORCID iD: 0000-0001-5163-9021 Shumpei Mori ORCID iD: 0000-0002-5803-7135 Eduardo Sternick ORCID iD: 0000-0003-3249-3711 Fellows Core Curriculum “Hands-on” UNUSUAL VARIANTS OF PREEXCITATION: FROM ANATOMY TO ABLATION: Part I - Understanding the anatomy of the variants of ventricular preexcitation Robert H Anderson 1 , BSc, MD, Damián Sánchez-Quintana 2 , MD, Shumpei Mori 3 , MD, Yash Lokhandwala 4 , MD, DM, Frederico Soares Correa 5,6 , MD, Hein JJ Wellens 7 , MD, PhD, FACC, Eduardo Back Sternick 5,6 , MD, PhD 1. Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom 2. Department of Anatomy and Cell Biology, Universidad de Extremadura, Badajoz, Spain 3. Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan 4. Arrhythmia Associates, Mumbai, India 5. Post-Graduation, Faculdade de Ciências Médicas, Belo Horizonte, Brazil 6. Arrhyhtmia and Electrophysiology Department, Biocor Institute, Nova Lima, Brazil 7. CARIM- Cardiovascular Research Centre Maastricht, The Netherlands Correspondence: Robert Anderson, MD, 60 Earlsfield Road, London SW18 3DN, United Kingdom. E-mail address: sejjran@ucl.ac.uk and eduardosternick@gmail.com