Differential diagnosis of the malignant lesion and the benign lesion is critically important for the precise treatment. A clinician should diagnose in a comprehensive manner considering clinical, radiological, and histopathological perspectives. The lesion in the oral cavity in this study was clinically and radiologically malignant. However, the lesion was histopathologically benign. Surgical intervention was not performed except biopsy. The lesion improved after about one month of supportive medication after the biopsy. The importance of decision making process was emphasized in this report.

Abstract
 Ⅰ. INTRODUCTION
 II. CASE REPORT
 III. DISCUSSION
 REFERENCES

• 오현준(서울대학교치과병원 구강악안면외과학교실) | Hyun Jun Oh (Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital)
• 전재호(서울대학교치과병원 구강악안면외과학교실) | Jae-ho Jeon (Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital)
• 명훈(서울대학교치과병원 구강악안면외과학교실, 서울대학교 치의학연구소) | Hoon Myoung (Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital, Dental Research Institute, Seoul National University) Correspondence