患者 ,男 ,43岁 ,左下唇麻木 2个月就诊 ,1个月前到神经科检查未找到原因 ,全身无其它不适。专科检查 :左下唇至正中皮肤及粘膜知觉缺失 ,皮肤、粘膜色泽正常 ,下颌骨质无膨隆 ,无触痛。左下颌骨区、侧位 X光片示 :左下颌骨体部有 1.5× 1.5 cm占位性病变。手术探查见 :左下颌 The patient, male, 43 years old, had numbness in the left lower lip for 2 months. He did not find the cause in a neurological examination 1 month earlier and he had no other discomfort. Specialist examination: lack of sensory perception of the skin and mucous membrane in the lower left lip to the middle, normal color of the skin and mucous membrane, no swelling of the jaw bone, no tenderness. In the left mandible region and lateral X-ray films, there was a 1.5 x 1.5 cm space-occupying lesion in the left mandible body. Surgical exploration see: left lower jaw