Pulmonary Vein Tissue (IMAGE) Boston Children's Hospital Caption This is a magnification of pulmonary vein tissue showing signs of pulmonary vein stenosis (plump abnormal cells stained dark magenta). Credit Callahan et al./Boston Children's Hospital Usage Restrictions Use only with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.