fa تخصصي Special مقالات اصيل Original Article <span style="font-size:11pt"><span style="line-height:150%"><span calibri="" style="font-family:"><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Osteochondroma, the most common benign tumor in the axial and appendicular skeleton, presents a unique challenge when encountered in the craniofacial region. We report a rare case of a 35-year-old female with a massive osteochondroma located on the mandibular coronoid process, resulting in a 20-year history of progressive mouth opening limitation, facial asymmetry, and zygomatic deformity. Comprehensive diagnostic procedures, including panoramic radiography and computed tomography (CT) imaging, were employed to accurately assess the extent of the lesion. This case highlights the importance of CT scans and three-dimensional reconstructions in confirming the diagnosis, particularly when panoramic radiographs exhibit limitations. The patient underwent a successful extraoral approach for coronoidectomy and excision of the osteochondroma, addressing both the functional and cosmetic aspects of the condition. Postoperative evaluations revealed significant improvement in mouth opening capacity, with no signs of recurrence during a 12-month follow-up period.</span></span></span></span></span></span><br> &nbsp; Osteocondroma, Coronoid process, Computed tomography 105 111 http://wjps.ir/browse.php?a_code=A-10-636-4&slc_lang=fa&sid=1 Moosa Mahmoodi 100319475328460016527 100319475328460016527 Yes 1. Oral and maxillofacial Diseases Research Center, Kerman University of Medical Sciences, Kerman, Iran Kianoosh Mobaaseri 100319475328460016528 100319475328460016528 No 2. Department of Oral and Maxillofacial Surgery, Dental School, Kerman University of Medical Sciences, Kerman, Iran Sara Samiei 100319475328460016529 100319475328460016529 No 2. Department of Oral and Maxillofacial Surgery, Dental School, Kerman University of Medical Sciences, Kerman, Iran Ali Labafchi 100319475328460016530 100319475328460016530 No 2. Department of Oral and Maxillofacial Surgery, Dental School, Kerman University of Medical Sciences, Kerman, Iran