Association of the patient’s complaints with tissue elasticity of salivary glands in patients with sialolithiasis. Panels show results for diseased SG and PG glands in individuals with: varying durations of the complaints (a), varying numbers of episodes (b) or intensities (VAS values) of subjective gland pain (c), varying numbers of episodes (d) or intensities (VAS values) of subjective gland swelling (e) (mean ± SD for n = 9–42 per group). ARFI, acoustic radiation force impulse imaging; PG, parotid gland; SD, standard deviation; SG, submandibular gland, VAS, visual analogue scale.