Post-infectious myositis ossificans in medial, lateral pterygoid muscles: A case report and review of the literature.

Qian Jiang,Chi Yang,Wei-Liu Qiu,Zhen Tian,Ya-Ting Qiu,Zhi-Yuan Zhang,Min-Jie Chen

doi:10.3892/ol.2014.2710

Qian Jiang, Chi Yang + Show 5 more

Open Access

https://doi.org/10.3892/ol.2014.2710

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Abstract

Myositis ossificans (MO) is a disease where heterotropic bone forms within a muscle or other type of soft tissue. MO is classified into two groups, MO progressiva and post-traumatic MO. It rarely occurs in the masticatory muscles and thus, only 20 cases involving the masticatory muscles have been reported since 2001. The majority of the reported cases occurred due to trauma, repeated injury or surgical manipulation. However, in a small number of cases, no specific traumatic event was identified as the cause of MO. To the best of our knowledge, this is the first case of post-infectious MO to be reported in the medial and lateral pterygoid muscles.

Highlights

Myositis ossificans (MO) is a disease where the formation of heterotropic bone occurs within a muscle or other type of soft tissue [1]
A rare case of MO in the medial and lateral pterygoid muscles that was caused by odontogenic infection is presented, which was diagnosed as post‐infectious MO (PIMO)
1 5 mandible to weaken the contractile force of the masseter muscle and mouth opening of 40 mm was achieved intraoperatively

Summary

Introduction

A rare case of MO in the medial and lateral pterygoid muscles that was caused by odontogenic infection is presented, which was diagnosed as post‐infectious MO (PIMO). Accounting for the medical history and clinicoradiological results, the patient was diagnosed with MO in the right lateral and medial pterygoid muscles. To remove the calcification in the lateral pterygoid muscle and reduce the tension on the mandible caused by the temporalis, a right coronoidectomy was performed using a reciprocating saw. The majority of the calcified and fibrotic fibers of the upper head of the right lateral pterygoid muscle were removed. An additional intraoral approach to the medial aspect of the mandibular was adopted via a mucoperiosteal incision of the retromolar area to reveal and access the calcified medial pterygoid muscle.

Discussion

Conner GA and Duffy M

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27. McCarthy EF and Sundaram M