Osteochondroma of the coronoid process: A case report and review of the literature

Abstract

Osteochondroma (OC) is considered the most common tumor of the axial skeleton, although it is relatively uncommon in the craniofacial region. The present study describes an atypical case of OC of the coronoid process. A 34-year-old woman presented with severely limited mouth opening (5 mm) and swelling of the right zygoma. Cone-beam computed tomography (CBCT) revealed a mushroom-shaped outgrowth from the coronoid process to the inner surface of the zygomatic arch, forming a pseudojoint. The patient was treated with coronoidectomy via an intraoral approach. Histopathological examination revealed features suggestive of OC. Subsequently, the patient was able to open their mouth, and there was no evidence of recurrence or post-operative complications in the 21-month follow-up. A review of the literature revealed only 38 histologically proven cases of coronoid OC in the past 30 years . The incidence of the disease was higher in men compared with that in women (male:female, 2.17:1), and the median age at onset was 28.7 years, with a range of 5-57 years. Gradual limitation of mouth opening and facial asymmetry are the most noticeable symptoms. Water's view and submentovertex projection of the zygomatic arch may be useful in identifying the tumor and its association with the zygoma, while CT and CBCT permit a detailed visualization of the location and density of the tumor. Coronoidectomy is the preferred treatment option, and the prognosis is excellent, with no evidence of recurrence or malignant transformation.

Osteochondroma Involving the Ramus of the Mandible: An Unusual Location

“…A poor metabolic activity is only present in benign lesions. Ultrasound radiography helps to examine the cartilaginous cap of the OC as a hypoechoic area above the cortex of the relevant bone [ 3 , 9 ].…”

“…To the best of our knowledge, the last 30 years revealed a total of 435 patients with OC in the craniofacial region. The most frequently affected site was the mandibular condyle (88.3%), followed by the coronoid process (8.7%) [ 3 ]. Only 4 cases have been reported previously involving the mandibular symphysis region [ 4 , 5 ], and 5 cases were reported involving the mandibular angle region [ 6 ], and only 1 case has been reported involving the ramus of the mandible [ 7 ].…”

Osteochondroma transform into secondary low grade chondrosarcoma with similar histology features: Case report

“…Osteochondroma most often affects the long bones of extremity (around the knee), scapula, and the pelvis. They are the most common primary tumors of the axial skeleton and make up 35% of benign bone tumors overall 3 . Most cases of osteochondroma are painless mass, asymptomatic, and discovered as an incidental finding.…”

Osteocondroma de apófisis coronoides: enfermedad de Jacob

“…2 Rara vez ocurre en la región craneofacial (menos de 1%) siendo aún menos común en la apófisis coronoides. 3,4 La etiología del tumor no se ha comprendido del todo. La teoría más aceptada es la hipótesis de Lichtenstein, que sugiere que el periostio tiene pluripotencialidad de producir tejido óseo y cartilaginoso.…”