title: Myositis ossificans traumatica of the medial pterygoid muscle: a case report.
abstract: 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.
authors.affiliation: Master's Program in Oral Biopathology, Radiology Area of São Paulo State University, São José dos Campos, SP, Brazil. ftrautmann@bol.com.br
authors.forename: Fernanda
authors.initials: F
authors.lastname: Trautmann
authors.forename: Paula de
authors.initials: Pd
authors.lastname: Moura
authors.forename: Tito L
authors.initials: TL
authors.lastname: Fernandes
authors.forename: Rogério O
authors.initials: RO
authors.lastname: Gondak
authors.forename: Julio C de M
authors.initials: JC
authors.lastname: Castilho
authors.forename: Edmundo Medici
authors.initials: EM
authors.lastname: Filho
mesh_terms: D000328:Adult; D054893:Cone-Beam Computed Tomography; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D009221:Myositis Ossificans / Q000000981:diagnostic imaging / Q000209:etiology* / Q000473:pathology / Q000601:surgery; D011626:Pterygoid Muscles / Q000293:injuries* / Q000473:pathology / Q000601:surgery; D016059:Range of Motion, Articular; D017695:Soft Tissue Injuries / Q000150:complications*