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Pseudomalignant myositis ossificans involving multiple masticatory muscles: Imaging evaluation
Muralidhar G Kamalapur1, Pritam B Patil1, Shyamsundar Joshi1
1Department of Radiodiagnosis and Imaging, SDM College of Medical Sciences and Hospital, Dharwad, Karnataka, India.
The Indian Journal of Radiology & Imaging
|May 23, 2014
Summary
Pseudomalignant myositis ossificans is a rare condition causing limited mouth opening. This case highlights its occurrence in multiple masticatory muscles without trauma history, confirmed by imaging and histology.
Area of Science:
- Radiology
- Pathology
- Oral and Maxillofacial Surgery
Background:
- Myositis ossificans is a rare benign bone-forming tumor.
- It can affect various muscles, including masticatory muscles, leading to trismus.
- Pseudomalignant myositis ossificans is a specific subtype characterized by rapid bone formation.
Observation:
- A patient presented with severe limitation in mouth opening.
- Imaging (CT and MRI) revealed bone density masses in the pterygoid and temporalis muscles.
- There was no history of trauma, which is unusual for this condition.
Findings:
- Radiological diagnosis of pseudomalignant myositis ossificans was made.
- Surgical resection of the masses was performed.
- Histopathologic examination confirmed the diagnosis.
Implications:
- This case expands the understanding of myositis ossificans presentation.
- It emphasizes the importance of considering this diagnosis in cases of trismus without trauma.
- Characteristic CT and MRI features are described for diagnostic aid.
