Although further investigation of long-term and prospective studies is needed, we identified 5 variables as predisposing factors for poor prognosis of angiosarcoma through meta-analysis. © 2016 Wiley Periodicals, Inc. Head Neck 39: 380-386, 2017.

Although a large-scale, randomized study is required for confirmation, both triamcinolone and radiation therapy provided outstanding treatment for ear keloids after surgical excision without a significant difference between the two treatments.