Journal of Oral Science
Online ISSN : 1880-4926
Print ISSN : 1343-4934
Case Report
Myositis ossificans traumatica of the medial pterygoid muscle: a case report
Fernanda TrautmannPaula de MouraTito L. FernandesRogério O. GondakJulio C. de M. CastilhoEdmundo Medici Filho
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2010 Volume 52 Issue 3 Pages 485-489


In this report, we present a case of myositis ossificans traumatica (MOT) of the medial pterygoid muscle that had developed after mandibular block anesthesia administered for endodontic treatment of the lower right second molar, demonstrating typical features of this condition. MOT should be considered as a differential diagnosis when there is severe limitation of jaw opening and an associated trauma. Panoramic radiographs and axial and coronal computed tomography (CT) scans can effectively delineate the calcified mass. Other imaging studies that may be helpful include magnetic resonance imaging (MRI), bone scans, and ultrasound. As shown in our case, calcified masses were found in the right mandibular angle, which severely limited jaw opening. Some earlier reported cases of MOT were treated by extraoral surgical approaches with complete removal of the evolving muscle. The aim of this case report is to present only the diagnostic imaging aspects of myositis ossificans traumatica. (J Oral Sci 52, 485-489, 2010)

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© 2010 by Nihon University School of Dentistry
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