Ker, James A.Du Toit, Lorraine2009-12-072009-12-072009-10Ker J & Du Toit, L 2009, 'The accessory papillary muscle with inferior J-waves---peculiarity or hidden danger?', Cardiovascular Ultrasound, vol. 7, no. 50. [http://www.cardiovascularultrasound.com/]0007-485310.1186/1476-7120-7-50http://hdl.handle.net/2263/12196Originally described in 1953, today the so-called J-wave is the source of much controversy. As a marker of so-called "early repolarization", this variant has been regarded as a totally benign variant since the 1960's. However, since then a wealth of data have indicated that the J-wave may be a marker of a highly arrhythmogenic substrate with a resultant high risk of sudden cardiac death. In this case report a case of an accessory papillary muscle with a prominent J-wave is described. This may be the first of many possible cases where papillary muscle variants may be the cause of the J-wave.en© 2009 Ker and du Toit; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Papillary muscleJ-wavesHidden dangerHeart -- Diseases -- DiagnosisArticle