Giant Protruding High-Grade Undifferentiated Pleomorphic Sarcoma Arising in a Keloid Scar on the Abdominal Wall. - Kinoshita H; Tsukanishi T; Ishii T; Kamoda H; Hagiwara Y; Orita S; Inage K; Hirosawa N; Ohtori S; Yonemoto T (Case reports in dermatological medicine, 2020)