Lady 17 yo with tumor on her left shoulder which was detected for 2 weeks, size of 3 cm, red and soft, no pain ( see photo 1,2).
On ultrasound examination, this tumor came from skin layer, inhomogenous with solid part in the root and calcification, while upper part is fluid (US 1, US 2). On CDI, tumor has hyper vascular pattern like an octopus.
What is your diagnosis ?