Benign masseter muscle hypertrophy

Daniel Zeni Rispoli,Paulo M Camargo,José L Pires,Vinicius R Fonseca,Karina K Mandelli,Marcela A.C Pereira

doi:10.1016/s1808-8694(15)31393-8

Daniel Zeni Rispoli, Paulo M Camargo + Show 4 more

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https://doi.org/10.1016/s1808-8694(15)31393-8

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Abstract

SummaryIdiopathic hypertrophy of the masseter muscle is a rare disorder of unknown cause. Some authors associate it with the habit of chewing gum, temporo-mandibular joint disorder, congenital and functional hypertrophies, and emotional disorders (stress and nervousness). Most patients complain of the cosmetic change caused by facial asymmetry, also called square face, however, symptoms such as trismus, protrusion and bruxism may also occur. The goals of the present investigation were: to report a case of idiopathic masseter hypertrophy, describe its symptoms and treatment. The patient reported bilateral bulging in the region of the mandible angle, of slow and progressive evolution. He did not complain of pain or discomfort, however there was bilateral otalgia, nighttime trismus and stress. In his physical exam we noticed bilateral masseter hypertrophy without local inflammatory alterations. We indicated surgical treatment with an extraoral approach. Complementary tests are indicated when there is diagnostic doubts. Treatment varies from conservative to surgical, and the later depends on surgeon skill and experience.

Highlights

Idiopathic masseter muscle hypertrophy (IMMH) was first described by Legg in 1880, reporting on the case of a 10-year-old girl with concurrent idiopathic temporalis muscle hypertrophy[1,2,3,4,7]
This paper describes one case of idiopathic masseter muscle hypertrophy, reviews the literature and proposes an effective treatment option for the patient
According to a review of 108 cases described in the literature until 1984, Baek found that patient average age was 30 years, 57% were males, 60% had bilateral involvement, and only five patients had concurrent temporalis muscle hypertrophy[13]

Summary

Idiopathic hypertrophy of the masseter muscle is a rare disorder of unknown cause. The goals of the present investigation were: to report a case of idiopathic masseter hypertrophy, describe its symptoms and treatment. The patient reported bilateral bulging in the region of the mandible angle, of slow and progressive evolution. He did not complain of pain or discomfort, there was bilateral otalgia, nighttime trismus and stress. In his physical exam we noticed bilateral masseter hypertrophy without local inflammatory alterations. We indicated surgical treatment with an extraoral approach.

INTRODUCTION

LITERATURE REVIEW

DISCUSSION

CONCLUSION