A 5-year-old boy presented at our clinic complaining of a firm swelling with mild tenderness in right cheek region. Panoramic X-ray did not reveal any evidence of odontogenous infection, suspected to be the cause of the mandibular osteomyelitis.α-Streptococcus was detected by exploratory punction of the lesion, and the histopathological diagnosis of the biopsy specimen was chronic suppurative osteomyelitis. Saucerization with curretage for the lesion was carried out in order to conserve the cortical bone on the medial side of the mandibular ramus and condyle. The cause of osteomyelitis could likewise not be identified during operation. New bone formation at the mandibular defect was observed by CT scan at 6 months after operation, and the patient's subsegvenr clinical course has been asymptomatic.
