The follicular lymphoid hyperplasia is a very rare nonneoplastic lymphoproliferative disease in the oral mucosa. Clinically, it usually presents as asymptomatic, non-ulcerated, normal-colored, soft, sessile, unilateral and slow growing mass in the posterior hard palate. Therefore, soft-tissue mass of the hard palate can be a difficult diagnostic challenge for the clinician. Herein, we report a case of follicular lymphoid hyperplasia located in the left posterior hard palate. A 40-year-old male presented a soft, non-ulcerated, painless mass of 1.5 X 1.0cm in size. Radiographically, it was no bony involvement. Histology revealed germinal center surrounding mantle zone of small lymphocytes. Immunohistochemistry showed CD3,CD20 were postive but Bcl-2 and cyclin D1 were negative. The patient underwent surgical excision and 3-year follow-up has not shown any evidence of recurrence.

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

• 차형석(원광대학교 치과대학 대전치과병원 구강악안면외과) | Hyung-Seok Cha
• 유동뢰(원광대학교 치과대학 대전치과병원 구강악안면외과) | Dong Lei Lyu
• 이준(원광대학교 치과대학 대전치과병원 구강악안면외과, 원광골재생연구소) | Jun Lee
• 윤정훈(구강병리과, 원광골재생연구소) | Jung-Hoon Yoon Corresponding Author