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CC BY-NC-ND 4.0 · Indian J Radiol Imaging 2014; 24(01): 75-79
DOI: 10.4103/0971-3026.130706
Head and Neck Radiology

Pseudomalignant myositis ossificans involving multiple masticatory muscles: Imaging evaluation

Muralidhar G Kamalapur
Department of Radiodiagnosis and Imaging, SDM College of Medical Sciences and Hospital, Dharwad, Karnataka, India
,
Pritam B Patil
Department of Radiodiagnosis and Imaging, SDM College of Medical Sciences and Hospital, Dharwad, Karnataka, India
,
Shyamsundar Joshi
Department of Radiodiagnosis and Imaging, SDM College of Medical Sciences and Hospital, Dharwad, Karnataka, India
,
Dinesh Shastri
Department of Pathology, SDM College of Medical Sciences and Hospital, Dharwad, Karnataka, India
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Abstract

Myositis ossificans is a rare cause of trismus. We present a case of pseudomalignant myositis ossificans involving medial pterygoid, lateral pterygoid, and temporalis muscles. Patient presented with gross limitation in mouth opening. There was no history of trauma. Computed tomography (CT) images revealed a bone density mass located in the region of medial and lateral pterygoid muscles on the right and temporalis muscle on the left. Magnetic resonance imaging (MRI) showed similar findings. Radiological diagnosis was pseudomalignant myositis ossificans. The masses were resected and histopathologic examination confirmed the above diagnosis. This report describes the characteristic CT and MRI features. The unique feature of this case is the absence of history of trauma with involvement of multiple masticatory muscles, which, to the best of our knowledge, has not been reported before.

Keywords

Pseudomalignant myositis ossificans - pterygoid muscles - temporal muscle


Publication History

Article published online:
02 August 2021

© 2014. Indian Radiological Association. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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