Figure 4: a) Pre-operative ultrasound scan of a 5-year-old girl with a stone measuring almost 9 mm (+…+) in the right parotid gland (DS: Stensen’s duct; GP: parotid gland; UK: lower jaw; MM: masseter muscle). b) Extracorporeal shockwave therapy under general anaesthetic. c) No stones or symptoms one year after the intervention, with an unremarkable ultrasound appearance of the right parotid gland. d) A 3-year-old boy after lithotripsy of a stone in the left parotid, showing petechial haemorrhages into the skin as a typical adverse effect of lithotripsy. These will be resorbed within a few days.