Lymphomatoid granulomatosis (LYG) is an uncommon Epstein-Barr virus (EBV)-associated B-cell lymphoproliferative disorder distinct from lymphoma. LYG primarily occurs in the lung with or without accompanied lesions in the skin, central nervous system, kidney, gastrointestinal tract, nose, eyes, liver and oral cavity. Solitary extrapulmonary LYG is extremely rare, and whether solitary lesions progress onto pulmonary development and dysfunction is controversial. Herein, we report a case on a solitary LYG in the maxilla gingiva with bone exposure in a patient who had been taking methotrexate for rheumatoid arthritis.

• 하태욱(연세대학교 치과대학 구강악안면외과학교실) | Tae-Wook Ha (Department of Oral and Maxillofacial Surgery)
• 알파델 후세인 이브라힘(연세대학교 치과대학 구강악안면외과학교실) | Hussain I Al-Fadhel (Department of Oral and Maxillofacial Surgery)
• 한다울(구강종양연구소 구강병리학교실) | Dawool Han (Department of Oral Pathology, Oral Cancer Research Institute, Yonsei University College of Dentistry)
• 양우익(연세대학교 의과대학 병리학교실) | Woo Ick Yang (Department of Pathology, Yonsei University College of Medicine)
• 김동욱(연세대학교 치과대학 구강악안면외과학교실) | Dong Wook Kim (Department of Oral and Maxillofacial Surgery)
• 조은애산드라(구강종양연구소 구강병리학교실) | Eunae Sandra Cho (Department of Oral Pathology, Oral Cancer Research Institute, Yonsei University College of Dentistry) Correspondence