患者男,26岁。1985年2月发现右下颌角前肿胀,不痛,不发烧。一月后,自党右下牙痛,张口受限。经某医院诊断为“冠周炎”,通过消炎治疗及拔除右下智齿后,张口受限缓解,面部肿胀消退。同年5月右下颌角前再次肿胀伴开口受限,初起有搔痒感,后起一硬结,并逐渐扩大如鸽蛋大, Male patient, 26 years old. February 1985 found the right mandibular angle before the swelling, no pain, no fever. After January, since the party right toothache, open mouth restricted. After a hospital diagnosis of “pericoronitis”, through the anti-inflammatory treatment and removal of the lower right wisdom teeth, mouth restriction and ease, facial swelling subsided. In the same year in May before the right mandibular angle re-swelling with limited openings, initially itching, flu after a knot, and gradually expanding, such as pigeon eggs,