Mandibular coronoid process hyperplasia: a case report

Meire Cristiane Alves Tolentino,Claudia Assunção E Alves Cardoso,Flávio Ricardo Manzi,Jocasta Santos Assis

doi:10.1590/1982-0216201820311417

Meire Cristiane Alves Tolentino, Claudia Assunção E Alves Cardoso + Show 2 more

Open Access

https://doi.org/10.1590/1982-0216201820311417

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Abstract

ABSTRACT Coronoid Process Hyperplasia is a rare condition characterized by the increase in size of a histologically normal bone. It can be confused with Temporomandibular Joint Dysfunction, due to the presence of major signs/symptoms, including the limitation of mouth opening, pain, and facial asymmetry. Although several theories have been proposed, the etiology remains unknown. The recommended treatment is mandibular coronoidectomy. In the present study, the importance of computed tomography to reach the proper diagnosis and the surgical treatment plan is demonstrated.

Highlights

Mandibular coronoid process is an anterior eminence of the mandibular ramus, where the temporal muscle is connected
Coronoid Process Hyperplasia is a rare condition characterized by the increase in size of a histologically normal bone
It can be confused with Temporomandibular Joint Dysfunction, due to the presence of major signs/symptoms, including the limitation of mouth opening, pain, and facial asymmetry

Summary

INTRODUCTION

Mandibular coronoid process is an anterior eminence of the mandibular ramus, where the temporal muscle is connected. Hyperplasia of the mandibular coronoid process (HCP) is a rare condition, which is characterized by cell growth of a histologically normal bone, and whose symptoms increase gradually[4].The most frequently reported symptoms are pain and limited mouth opening[5]. Elongated coronoid processes affect the medial surfaces of zygomatic arches at the mouth opening, which limit mandible movement and lead to trismus[6]. The first is characterized by the joint between the coronoid process and the jawbone, accompanied by cartilaginous structures and the formation of a synovial capsule[8] The latter is characterized by any alterations that affect masticatory muscles, the temporomandibular joint (TMJ), and adjacent structures[9]. Hyperplasia caused the zygomatic arch and the zygomatic bone on the right side to expand and become thinner (Figures 1 to 5)

RESULTS

DISCUSSION

CONCLUSION