在无下颌骨骨折情况下的颏结节折裂是罕见的,文献中仅见6例报道。作者报道一例因口底前区疼痛和肿胀10天入院的68岁白人妇女,舌活动和吞咽时疼痛。上下牙缺失30年,无其他特殊病史。检查发现:口底有—2cm×1cm、质硬、触痛、充血性肿块,伴有一小溃疡,口腔全景片显示上下牙槽嵴严重萎缩;咬合片显示肥大的颏结节,前端有一折裂线。粘膜溃疡组织病检为纤维炎性增生。局麻下暴露颏结节并予以去除,颏舌骨肌和颏舌肌重附丽在下颌骨膜上。术后12天纤维炎性增生消失,吞咽困难解除,随访8个月,舌功能正常,未见炎症复发。颏结节肥大常与无牙下颌骨吸收有关。一般说来,下牙槽嵴的吸收比上牙槽嵴快4倍,牙槽嵴高度的降 Chinodular fracture is rare in the absence of mandibular fractures, with only 6 reported in the literature. The authors report a case of a 68-year-old Caucasian woman admitted to hospital for 10 days with pain and swelling in the anterior floor of the mouth with tongue activity and swallowing pain. Upper and lower teeth missing 30 years, no other special medical history. Check found: the mouth of a -2cm × 1cm, hard, tender, congestive mass, accompanied by a small ulcer, oral panoramic film shows a serious atrophy of the alveolar crest; occlusal films show hypertrophy of the chin nodules, a fracture of the front line. Mucosal ulcer tissue disease as fibrous hyperplasia. Under local anesthesia, chin and nodules were exposed and removed, and the genioglossus and genioglossus were attached to the mandibular periosteum. 12 days after fibrinolytic hyperplasia disappeared, swallowing difficulties, follow-up 8 months, normal tongue function, no inflammation recurrence. Chin nodules hypertrophy often associated with toothless mandibular absorption. In general, the lower alveolar ridge absorption than the upper alveolar ridge 4 times faster, lower alveolar height