Figure 4.

US-guided injection in the deep temporal region: (a) The entry point is marked on the skin; (b) “scan before injecting” technique, the middle of the probe is positioned at the marker; (c) color Doppler US imaging (LOGIQ E10 GE) showing the middle of the screen (yellow arrowhead), which corresponds to the middle of the probe, and is projected (white dotted line) on the deep portion of the temporalis muscle and the periosteum (grey band), where the deep temporal arteries are expected to run. This projection should be extensively checked for the deep temporal artery; the frontal branch of the superficial temporal artery shows in red; (d) low supraperiosteal injection is being conducted after US scanning.