Langerhans cell histiocytosis (LCH) is a rare disease that arises from an abnormal increase in histiocytes. Due to its rare occurrence, the diagnosis of LCH is often delayed or missed. This report presents a case of LCH in a 16-month-old girl. After biopsy, the patient’s previous medical records were obtained. The records described the presence of a yellowish plaque on the forehead since birth, a characteristic feature of LCH. Earlier knowledge of this medical history would have helped facilitate the diagnosis of LCH. This report aims to inform clinicians of the clinical and histopathological features of LCH in order to aid in the early diagnosis of this disease, which can occur in infancy.

Ⅰ. INTRODUCTION
Ⅱ. CASE REPORT
Ⅲ. DISCUSSION
Ⅳ. CONCLUSION

• 김도형(경북대학교 치과대학 구강악안면외과학 교실) | Do-Hyoung Kim (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyungpook National University)
• 최소영(경북대학교 치과대학 구강악안면외과학 교실) | So-Young Choi (Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyungpook National University) Corresponding author