RT Journal Article SR Electronic T1 Papillary endothelial hyperplasia in a TEC coronary atherectomy specimen. JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 572 OP 573 DO 10.1136/hrt.77.6.572 VO 77 IS 6 A1 J. G. Crilley A1 C. Ritchie A1 M. A. de Belder YR 1997 UL http://heart.bmj.com/content/77/6/572.abstract AB Angiography in a 37 year old female with a three week history of typical crescendo angina found an 80% stenosis of the proximal left anterior descending (LAD) artery. The patient underwent percutaneous transluminal coronary angioplasty involving TEC artherectomy of the LAD artery. The specimen removed by atherectomy was found to have the appearance of papillary endothelial hyperplasia. This is an unusual histological diagnosis that occurs in association with thrombus. It is rarely found within arterial vessels and has not been reported in a coronary artery. Papillary endothelial hyperplasia is now thought to be a form of organising thrombus, probably dependent on the production of basic fibroblast growth factor by the endothelium.