Figure 1.

Schematic overview of key characteristics in common cosmetic fillers and lifting threads. The illustration also shows different artifact patterns: (a,b) strong posterior acoustic enhancement or reinforcement; (c) no visible artifacts, due to low difference between the acoustic impedance of pure silicone and surrounding tissue; (d) slight posterior acoustic reinforcement; (e) diffuse reverberation artifacts known as ‘snowstorm’ pattern; (f) posterior acoustic shadowing, due to calcium; (g) focal reverberation artifacts known as ‘mini-comet tail’; (h) posterior acoustic shadowing and (i) absorbable threads do not produce posterior acoustic shadowing.