TY - CHAP M1 - Book, Section TI - Vascular Tumors A1 - Macarthur, Kelly M. A1 - Püttgen, Katherine A2 - Kang, Sewon A2 - Amagai, Masayuki A2 - Bruckner, Anna L. A2 - Enk, Alexander H. A2 - Margolis, David J. A2 - McMichael, Amy J. A2 - Orringer, Jeffrey S. Y1 - 2019 N1 - T2 - Fitzpatrick's Dermatology, 9e AB - Vascular anomalies commonly present as birthmarks.1 Their classification has historically been problematic, with contradictory and confusing terminology and nomenclature. Although several classification schemes exist, the most widely accepted and comprehensive is the International Society for the Study of Vascular Anomalies (ISSVA) classification, updated in 2014, to incorporate clinical, imaging, histologic and (where known) genetic characteristics.1,2 Vascular anomalies are broadly divided into vascular malformations and vascular tumors.3 Vascular malformations (see Chap. 147) are errors of vascular morphogenesis whereas infantile hemangiomas and other vascular tumors are proliferative. Vascular tumors in the current ISSVA classification are subdivided into (a) benign, (b) locally aggressive or borderline, and (c) malignant; each has unique features based upon histology, biology, clinical appearance, behavior, prognosis, and treatment (Table 118-1). SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accessmedicine.mhmedical.com/content.aspx?aid=1161336744 ER -