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In Vivo Functional Assessment of Rat Masseter Muscle Following Surgical Creation of a Volumetric Muscle Loss (VML) Injury
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Masseter Muscle Size in Chronic Parotid Sialadenitis.

Erika M Stephens1, William E Nesmith1, M Allison Ogden2

  • 1Department of Otolaryngology-Head and Neck Surgery University of California-San Francisco San Francisco California USA.

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|June 11, 2025
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Summary

Masseter muscle thickness is greater in patients with obstructive parotid sialadenitis. This finding suggests a link between increased masseter size and parotid gland inflammation, potentially impacting treatment strategies.

Keywords:
masseter sizesalivary glandssalivary stonessialadenitissialendoscopystenosis

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Area of Science:

  • Anatomy
  • Radiology
  • Otolaryngology

Background:

  • The link between masseter muscle size and parotid duct obstruction causing recurrent sialadenitis is unclear.
  • Understanding this relationship may offer insights into disease mechanisms.

Purpose of the Study:

  • To assess masseter muscle dimensions in patients with chronic parotid sialadenitis.
  • To compare masseter muscle size between patients with and without parotid sialadenitis.

Main Methods:

  • Retrospective analysis of patients with symptomatic chronic sialadenitis.
  • Masseter and lateral pterygoid muscle measurements on CT/MRI by blinded investigators.
  • Focus on masseter thickness near the parotid duct trajectory.

Main Results:

  • Significantly greater masseter thickness in parotid sialadenitis patients (15.8 mm) vs. submandibular (14.5 mm).
  • Increased masseter thickness associated with higher BMI, male sex, and parotid symptoms.
  • Female sex and masseter muscle thickness independently predicted parotid gland sialadenitis.

Conclusions:

  • Masseter muscle thickness is significantly larger in patients experiencing obstructive parotid sialadenitis.
  • This association suggests potential implications for understanding sialadenitis pathophysiology and therapeutic approaches.