The differential diagnosis of a mass within the masseter includes congenital cyst, lymphadenopathy, sialocele of parotid duct, parotid neoplasm, lymphangioma, benign or malignant muscle tumour, ...

Kim H J, Yum K W, Lee S S et al. Effects of Botulinum Toxin Type A on Bilateral Masseteric Hypertrophy evaluated with computed tomographic measurement. Dermatol Surg 2003; 29: 484–489.

Studies of high methodological quality (systematic reviews or randomised controlled trials; RCT) were selected if considered use of botulinum toxin (BTX) either prophylactically or therapeutically ...