RT Book, Section A1 Kelly, Michael E. A1 Adams, Denise M. A2 Kline, Mark W. SR Print(0) ID 1182911748 T1 Vascular Neoplasms T2 Rudolph's Pediatrics, 23e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259588594 LK accesspediatrics.mhmedical.com/content.aspx?aid=1182911748 RD 2024/04/19 AB Vascular tumors in children are rare and their classification has been difficult, especially in the pediatric population, because of their unusual morphologic appearance, diverse clinical behavior, and lack of independent stratification for pediatric tumors in the World Health Organization’s (WHO) 2013 classification system. In 2014, the International Society for the Study of Vascular Anomalies (ISSVA) updated their classification system. Although the ISSVA classification of vascular tumors is based on the WHO classification (refer to Tables 458-1 and 458-2), it uses more precise terminology and phenotypes.