Oral adenosquamous carcinoma (ASC) is a rare and aggressive type of squamous cell carcinoma (SCC). It is characterized by a squamous component originating at the mucosa and a deep glandular component. ASC may be misdiagnosed as SCC by superficial incisional biopsy including only the squamous component. ASC has a worse prognosis than general variants of SCC, so accurate diagnosis is essential for patient survival. We present a case report of a large ASC arising in the buccal mucosa, first mistaken as general SCC.

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

• 박슬마로(연세대학교 치과대학 구강악안면외과학교실) | Slmaro Park (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University)
• 최성환(연세대학교 치과대학 구강악안면외과학교실) | Sung-Hwan Choi (Department of Oral and Maxillofacial Surgery, 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)
• 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)
• 김형준(연세대학교 치과대학 구강악안면외과학교실) | Hyung Jun Kim (Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University) Correspondence