患者男,56岁。挑重担后突发胸闷、气促3个月,加重1个月,无咳嗽、咯血、畏寒、发热症状。专科检查:胸廓对称无畸软,有压痛。实验室检查无阳性发现。影像学检查:B超示左侧胸腔内混合性包块。正位胸片提示左侧胸腔内占位或胸腔积液(图1)。CT平扫示左侧胸腔内见一巨大肿块影,呈椭圆 Male patient, 56 years old. Heavy burden after chest tightness, shortness of breath 3 months, increased 1 month, no cough, hemoptysis, chills, fever symptoms. Specialist examination: No symmetrical thoracic soft, tenderness. No positive laboratory tests found. Imaging examination: B ultrasound showed intrathoracic mixed mass. Anterograde chest prompted left pleural space or pleural effusion (Figure 1). CT scan showed a huge mass in the left chest cavity shadow, oval