title: Imaging of vascular tumors with an emphasis on ISSVA classification.
abstract: The International Society for the Study of Vascular Anomalies (ISSVA) classification is becoming the international standard classification system for vascular tumors and vascular malformations. The ISSVA classification strictly distinguishes vascular tumors (neoplastic lesions) from vascular malformations (non-neoplastic lesions) based on whether there is a proliferation of vascular endothelial cells present, and it is an extremely useful classification system for determining therapeutic measures. For vascular tumors, it is clinically significant in terms of discriminating infantile hemangioma and rapidly involuting congenital hemangioma, which are expected to spontaneously regress, from other vascular tumors requiring treatment. Needless to say, clinical courses are important for diagnosis, and it is also important for radiologists to understand imaging findings on vascular tumors because such tumors have unique findings on diagnostic images. In this paper, vascular tumors are classified based on the ISSVA classification, and clinical and imaging findings are reviewed.
authors.affiliation: Department of Radiology, St. Luke's International Hospital, 9-1 Akashi-Cho, Chuo-Ku, Tokyo, 104-8560, Japan, nojyakki@gmail.com.
authors.forename: Taiki
authors.initials: T
authors.lastname: Nozaki
authors.forename: Masaki
authors.initials: M
authors.lastname: Matsusako
authors.forename: Hidefumi
authors.initials: H
authors.lastname: Mimura
authors.forename: Keigo
authors.initials: K
authors.lastname: Osuga
authors.forename: Mizuko
authors.initials: M
authors.lastname: Matsui
authors.forename: Hikaru
authors.initials: H
authors.lastname: Eto
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Ohtake
authors.forename: Atsushi
authors.initials: A
authors.lastname: Manabe
authors.forename: Isao
authors.initials: I
authors.lastname: Kusakawa
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Tsutsumi
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Nosaka
authors.forename: Minobu
authors.initials: M
authors.lastname: Kamo
authors.forename: Yukihisa
authors.initials: Y
authors.lastname: Saida
mesh_terms: D001808:Blood Vessels / Q000002:abnormalities; D002648:Child; D002675:Child, Preschool; D017789:Granuloma, Pyogenic / Q000473:pathology; D006390:Hemangioendothelioma / Q000473:pathology; D006391:Hemangioma / Q000151:congenital / Q000473:pathology; D006394:Hemangiosarcoma; D006801:Humans; D007223:Infant; D059885:Kasabach-Merritt Syndrome / Q000473:pathology; D008279:Magnetic Resonance Imaging; D012514:Sarcoma, Kaposi / Q000473:pathology; D012955:Societies, Medical; D019043:Vascular Neoplasms / Q000145:classification* / Q000473:pathology; D014944:World Health Organization