A case of osteochondroma of the coronoid process

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  • TAKAFUJI Hiroyuki
    Department of Oral and Maxillofacial Surgery, Kyoto City Hospital
  • FUJIMURA Kazuma
    Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University
  • TAKAHASHI Katu
    Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University
  • YAMORI Masasi
    Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University
  • OKUBO Yasunori
    Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University
  • BESSHO Kazuhisa
    Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kyoto University

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Other Title
  • 筋突起に生じた骨軟骨腫の1例
  • キン トッキ ニ ショウジタ コツ ナンコツ シュ ノ 1レイ

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Abstract

Jacob disease is a rare condition that affects the coronoid process. In 1899, Jacob was the first to describe osteochondroma of the coronoid process, forming a pseudoarthrosis joint between the coronoid process and the zygomatic arch. A 21-year-old man with a 7-year history of progressive limitation of mouth opening was referred to our hospital by his dentist. The maximum interincisal opening was 20 mm. A radiographic examination showed a right enlarged fungiform coronoid process. Three-dimensional computed tomography clearly demonstrated the anatomic relation between the coronoid process and the surrounding bony structure. The coronoid process was bilaterally excised by an intraoral approach. Histopathological examinations revealed compact cortical bone surrounded by a thin band of cartilage tissue diagnosed as osteochondroma, which matched the characteristics of Jacob disease. After the operation, the maximum interincisal opening was 48 mm.

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