[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-458358-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-458358-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","giant-peripheral-osteoma-of-the-mandibular-antegonial-notch-in-an-elderly-patient-a-case-report","Giant Peripheral Osteoma of the Mandibular Antegonial Notch in an Elderly Patient - A Case Report","","Peripheral osteoma is a benign craniofacial bone tumor that is common in the skull and facial skeleton but extremely uncommon at or near the mandibular antegonial notch, especially when large and in elderly patients. This case report presents an 80-year-old man with an asymptomatic hard swelling in the left submandibular area. Imaging showed a pedunculated, homogeneously radiodense 50 × 45 × 40 mm cortical mass. Complete en bloc excision with cortical margin and titanium plate reinforcement was performed. Histology confirmed compact-type peripheral osteoma with no atypia. Recovery was uneventful except transient marginal mandibular nerve weakness, and no recurrence occurred during 15 months of follow-up. The report emphasizes differential diagnosis, detailed imaging, and long-term surveillance.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/healthcare/","Healthcare",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/giant-peripheral-osteoma-of-the-mandibular-antegonial-notch-in-an-elderly-patient-a-case-report/458358/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/giant-peripheral-osteoma-of-the-mandibular-antegonial-notch-in-an-elderly-patient-a-case-report/458358.png","ImageObject",300,407,{"name":42,"@type":43},"Taylor Morgan","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-30","2026-09-30",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",7,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What makes this peripheral osteoma case unusual?","Question",{"text":63,"@type":64},"The lesion arose at or near the mandibular antegonial notch, a location reported as extremely rare. It was also giant-sized and occurred in an elderly patient.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"How was the tumor evaluated before surgery?",{"text":68,"@type":64},"Imaging demonstrated a pedunculated, homogeneously radiodense mass originating from the cortical surface of the left mandibular antegonial notch, without cortical destruction or associated soft tissue mass.",{"name":70,"@type":61,"acceptedAnswer":71},"What treatment and follow-up outcomes were reported?",{"text":72,"@type":64},"The lesion was removed en bloc through an extraoral submandibular approach with a thin margin of normal cortical bone, and mandibular cortex was reinforced with a titanium plate. Postoperatively, only transient marginal mandibular nerve weakness occurred, and no recurrence was observed over 15 months.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},458358,1791179117,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":107,"slug":108},40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":55,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":110,"language":139,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":12,"update_tm":143,"read_time":117,"preview_page_count":4},1099523885336,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Review began 11/25/2025  \nReview ended 12/01/2025  \nPublished 12/09/2025  \n© Copyright 2025  \nSawai et al. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0. , which permits unrestricted use , distribution , and reproduction in any medium , provided the original author and source are credited.  \nDOI: 10.7759/cureus.98781  \nOpen Access Case Report  \nGiant Peripheral Osteoma of the Mandibular Antegonial Notch in an Elderly Patient: A Case Report  \nYasuhisa Sawai 1 , Eiji Mitate 1 , Yota Yamauchi 1, Miho Hasumoto 1 , Satoshi Wada 1, Hiroyuki Nakano 1 1. Department of Oral and Maxillofacial Surgery, Kanazawa Medical University, Uchinada, JPN Corresponding author: Yasuhisa Sawai, [y-sawai@kanazawa-med.ac.jp](y-sawai@kanazawa-med.ac.jp)  \nAbstract  \nPeripheral osteoma is a benign bone tumor that frequently arises in the craniofacial skeleton. In the mandible, it usually involves the body or condyle, whereas lesions at or near the antegonial notch are extremely rare, particularly when they are large and occur in elderly patients. This report describes the case of an 80-year-old man who presented with an asymptomatic hard swelling in the left submandibular region. The maximal interincisal mouth opening was approximately 40 mm, which was within normal limits, and there was no mandibular deviation. Imaging revealed a pedunculated, homogeneously radiodense mass measuring 50 × 45 × 40 mm arising from the cortical surface of the left mandibular antegonial notch without cortical destruction or associated soft tissue mass. The lesion was removed en bloc via an extraoral submandibular approach together with a thin margin of normal cortical bone, and the markedly thinned mandibular cortex was reinforced with a titanium plate. Histopathological examination showed dense lamellar bone with small marrow spaces and no cellular atypia, consistent with compact-type peripheral osteoma. The postoperative course was uneventful apart from transient weakness of the marginal mandibular branch of the facial nerve, and no recurrence has been observed during 15 months of followup. In this case, the exact onset and growth rate of the lesion could not be determined because previous radiographs were unavailable, and relatively rapid enlargement over a short period could not be excluded. Chronic mechanical stimulation and local circulatory changes in the masseter region may have contributed to tumor development and growth ; however, their roles remain speculative. This case highlights the importance of considering peripheral osteoma in the differential diagnosis of unilateral mandibular swelling, especially in atypical locations, and underscores the utility of detailed imaging evaluation and long-term postoperative surveillance.  \nCategories: Pathology, Dentistry, Oral Medicine  \nKeywords: antegonial notch, compact osteoma, giant osteoma, mandible, peripheral  \nIntroduction  \nOsteoma is a benign bone tumor characterized by the proliferation of mature bony tissue and occurs predominantly in the craniofacial skeleton [1] . Its growth is typically extremely slow, and the lesion may remain asymptomatic for a prolonged period, often being discovered only when facial deformity, malocclusion, or dysphagia becomes apparent [2] .  \nPeripheral osteomas arise from the periosteum and form exophytic masses attached to the cortical surface. They are generally regarded as slowly enlarging lesions with a favorable prognosis [1-3]. In the mandible, peripheral osteomas most frequently involve the body and condylar region, whereas lesions arising near the angle or antegonial notch are exceptionally uncommon [4-6]. Only a few cases of peripheral osteoma at the mandibular antegonial notch have been documented in the literature, and some of these lesions reached a considerable size before being detected [5,7,8]. Because of their rarity and deep location, such tumors may escape notice until they cause visible facial asymmet","cbCaigaYknIo3iKR","https://ap.wps.com/l/cbCaigaYknIo3iKR","pdf",5278725,"English","# Abstract\n# Introduction\n# Case Presentation","[{\"question\":\"What makes this peripheral osteoma case unusual?\",\"answer\":\"The lesion arose at or near the mandibular antegonial notch, a location reported as extremely rare. It was also giant-sized and occurred in an elderly patient.\"},{\"question\":\"How was the tumor evaluated before surgery?\",\"answer\":\"Imaging demonstrated a pedunculated, homogeneously radiodense mass originating from the cortical surface of the left mandibular antegonial notch, without cortical destruction or associated soft tissue mass.\"},{\"question\":\"What treatment and follow-up outcomes were reported?\",\"answer\":\"The lesion was removed en bloc through an extraoral submandibular approach with a thin margin of normal cortical bone, and mandibular cortex was reinforced with a titanium plate. Postoperatively, only transient marginal mandibular nerve weakness occurred, and no recurrence was observed over 15 months.\"}]","Giant Peripheral Osteoma of the Mandibular Antegonial Notch in an Elderly Patient - A Case Report | PDF",1790752687]