尤文氏瘤好发于四肢长骨和骨盆，发生于颌骨者极为少见。我科收治１例，现报告如下。患者男，１６岁。因右侧颌面部包块２个月入院。检查：右颌面部有一约３．０ｃｍ×４．０ｃｍ大包块，质地中等，边界不清，无压痛；自口内颊粘膜处可触及该肿块，与上颌骨粘连。Ｘ线片示未见 Ewing's tumor occurs in the long bones and pelvis limbs, occurred in the jaw are extremely rare. I received 1 cases of subjects, are as follows. Male patient, 16 years old. Due to the right maxillofacial mass 2 months admitted. Check: The right maxillofacial area has a large mass of about 3.0cm × 4.0cm, medium texture, the boundary is unclear, no tenderness; since buccal mucosa can touch the mass, and the maxillary adhesions. X-ray film showed no