Oral examination in a patient with a history of acute lymphoblastic leukemia (ALL) and allogeneic hematopoietic cell transplantation (HCT) needs considerations of leukemia relapse and graft-versus-host disease (GVHD). Oral manifestations may contribute to early detection of relapse or systemic complications making accurate oral examination and diagnosis significant. We report a case of a large tumor like mass arising in a patient with a history of ALL and HCT. The patient had been diagnosed with ALL relapse and was being treated with chemotherapy, and furthermore was suspected of GVHD development.

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

• 최성환(연세대학교 치과대학 구강악안면외과학교실) | Sung-Hwan Choi (Department of Oral and Maxillofacial Surgery College of Dentistry, Yonsei University)
• 박슬마로(연세대학교 치과대학 구강악안면외과학교실) | Slmaro Park (Department of Oral and Maxillofacial Surgery College of Dentistry, Yonsei University)
• 김현실(연세대학교 치과대학 구강병리학교실, 연세대학교 치과대학 구강종양연구소) | Hyun Sil Kim (Department of Oral Pathology College of Dentistry, Yonsei University, Oral Cancer Research Institute College of Dentistry, Yonsei University)
• 조은애산드라(연세대학교 치과대학 구강병리학교실, 연세대학교 치과대학 구강종양연구소) | Eunae Sandra Cho (Department of Oral Pathology College of Dentistry, Yonsei University, Oral Cancer Research Institute College of Dentistry, Yonsei University) Correspondence