摘要病例资料患者,男,1岁,发现颈部包块20余天,无发热、咳嗽、呼吸困难、紫绀等。体格检查：左颈部可触及大小约2.5cm×1.5cm包块,质地韧,边界不清,无波动感。右颈部可触及数个约蚕豆大小淋巴结。颈、胸部CT平扫及增强扫描示左上纵隔类圆形低密度影向上突入颈部达左侧甲状腺上极平面,与周围组织分界不清,横断面大小约4.0 cm×4.5 cm,
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