Expansile Osteolytic Lesion of the Mandible in a Pediatric Patient: A Case of Ewing\'s Sarcoma

Firm, diffuse swelling was accompanied by mild bony expansion with slight vestibular obliteration in the posterior region.Mouth opening was adequate, and the mucosa appeared normal (Fig. 1).Ultrasonography revealed a 42 37 29 mm hypoechoic lesion with internal vascularity.An orthopantomogram (OPG) showed an ill-defined osteolytic lesion in the right mandibular ramus.Magnetic resonance imaging (MRI) demonstrated an expansile intraosseous osteolytic lesion with soft tissue involvement, cortical irregularity, and a cortical breach.With extensive cortical irregularity and localized remnant bone, contrast-enhanced computed tomography (CT) indicated an expanding isodense osteolytic lesion covering the entire right mandibular ramus.There were no visible periosteal responses or sclerotic borders (Fig. 2).Differential diagnoses included osteomyelitis, aneurysmal bone cyst, osteosarcoma, and ES, while a provisional diagnosis of juvenile ossifying fibroma was considered.Fine-needle aspiration cytology (FNAC) revealed IntroductIonEwing's sarcoma (ES) is a rare, aggressive, poorly differentiated malignant small round cell tumor of bone and soft tissues, predominantly affecting children and young adults.Second most prevalent in adolescents and young adults, it makes up 10-15% of all malignant bone tumors. 1,2James Ewing described this type of tumor in 1920 as originating from undifferentiated osseous mesenchymal cells, mostly affecting people aged 10-20 years. 3ith a male-to-female ratio of 1.5:1, it is unusual either before 5 years of age or after 30 years.Familial cases are extremely rare. 4ES in the head and neck is uncommon, comprising <3% of all cases.In the maxillofacial region, it predominantly affects the mandible, followed by the maxilla.Approximately 26% of patients with ES reported the onset of symptoms following minor trauma.This may bring attention to a preexisting tumor rather than act as a causative factor, as supported by recent literature. 5 Tumor site, volume, and metastases determine the prognosis. 5,6The clinical, radiographic, and histological findings involving the mandible in a 12-year-old boy are presented in this case report.Informed consent for publication was obtained from the patient's parents.