Imaging Sci Dent.  2013 Mar;43(1):45-48. 10.5624/isd.2013.43.1.45.

An unusual cause for trismus caused by mandibular coronoid osteoma: a case report

• Vashishth
• Garg K
• Patil P
• Sreenivasan V

• KMID: 2167446
• DOI: http://doi.org/10.5624/isd.2013.43.1.45

Abstract

Osteoma is a dense bony proliferation of otherwise normal membranous bone. This tumor is essentially restricted to the craniofacial skeleton and is rarely diagnosed in other bones. The mandible and the paranasal sinuses are the most common sites, while the involvement of the coronoid process has been reported in only 6 cases so far. This report demonstrated a case of osteoma occurring at the mandibular coronoid process in a 26-year-old female patient. The patient was managed with surgical resection of the osteoma followed by physiotherapy.

Keyword

Osteoma; Mandible; Trismus

MeSH Terms

Female
Humans
Mandible
Osteoma
Paranasal Sinuses
Skeleton
Trismus

Figure

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  Fig. 1 Extra-oral photograph of the patient shows reduced mouth opening of 22 mm with deviation of the mandible towards the right side.

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  Fig. 2 Panoramic radiograph shows a radiopaque mass extending medially from the right coronoid process.

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  Fig. 3 A. A non-contrast axial computed tomographic (CT) image of the area shows a 16 mm×13 mm pedunculated bony outgrowth associated with the right coronoid process. B. A three-dimensional CT image shows a right coronoid mass.

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  Fig. 4 The photograph of the surgical specimen shows a mushroom-shaped bony mass extending from the right coronoid process.

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  Fig. 5 A. A microscopic view of the specimen showing irregular trabeculae of the bone with fibrocellular connective tissue stroma (H&E stain, ×40). B. A high power view shows lamellated compact bone with osteoblastic rimming and osteocytes within the lacunae (H&E stain, ×100).

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  Fig. 6 One year post-operative follow-up shows a mouth opening of 35 mm.

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