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Updated: Jul 16, 2026

Ultrasound-guided Botulinum Toxin-A Injections: A Method of Treating Sialorrhea
Published on: November 9, 2016
Anatomic considerations for treatment with botulinum toxin
Gary M Petrus1, David Lewis, Corey S Maas
1The Maas Clinic, San Francisco, CA 94109, USA.
Abstract:
Botulinum toxin A treatment continues to increase in popularity and number. Many more patients are undergoing cosmetic Botox procedures and many, diverse practitioners are providing them. The best results are obtained from a careful history and physical examination of the patient combined with a detailed understanding of facial and neck anatomy. Understanding the dynamic anatomic relationships, such as agonist-antagonist muscles and contraction force vectors, is key to providing the patient with an excellent outcome.
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