患儿刘××,女,3岁。1978年7月初发热,右颊部肿痛及V牙痛,但不严重,20天后来院门诊,诊断为右颊部淋巴结炎及V尖周炎,给于消炎药内服及V开放引流,但肿胀一直未消退,2月后复诊,右侧下颌角前上方有2×2cm之肿块,界限清楚,局部皮肤不红,轻度压痛。X线片显示右下颌角及下颌升枝部 Liu × × children, female, 3 years old. In early July 1978 fever, right cheek pain and V toothache, but not serious, 20 days later to the hospital, diagnosed with right cheek lymphadenitis and V periapical inflammation, oral administration of anti-inflammatory drugs and V open drainage, but swelling has been Not subsided, 2 months after referral, right above the mandibular angle before the 2 × 2cm mass, clear boundaries, the local skin is not red, mild tenderness. X-ray shows the right mandibular angle and mandibular liter