Osteochondroma of the sigmoide notch: a case report of an unusual location

Ana Reis Durão,Marcelo Miranda,Israel Chilvarquer,Aline Cantarelli Morosolli,José T Koch,Márcia Provenzano

doi:10.15448/1980-6523.2016.3.20097

Abstract

Objective: This article presents an interesting case of osteochondroma of the the sigmoid notch.Case Report: A 15-year-old female with severe facial asymmetry, malocclusion, open bite and extreme limitation of mouth opening. Panoramic radiography showed an exophytic radiopaque mass arising from the sigmoid notch on the right side. CT images revealed bony proliferation with benign signs causing damage to the articular eminence, condilar morphology and periarticular soft tissue calcifications. Magnetic Resonance confirmed the findings of the CT and revealed modifications on disc morphology. A surgical resection was performed.Conclusion: The OC located at the sigmoid notch presented is probably the rarest site seen in the existing literature.

Highlights

Osteochondroma (OC), or osteocartilaginous exostose, is a benign tumour of mature hyaline cartilage, most commonly found at the ends of long bones [1,2,3]
This pseudoarticulation leads to restricted jaw movement, which can clinically be mistaken for temporomandibular joint dysfunction
The patient presented with increasing mouth opening reduction that has been getting worst over time

Summary

Introduction

Osteochondroma (OC), or osteocartilaginous exostose, is a benign tumour of mature hyaline cartilage, most commonly found at the ends of long bones [1,2,3]. Osteocondroma do sulco sigmoide: relato de caso em uma localização rara Mouth opening reduction is the most consistent clinical feature of OC [6]. It presents with modifications at the occlusion [7,8,12], development of facial asymmetry, and a posterior apertognathia on the affected side [13], pain with varying intensity [7,8].

Results

Conclusion