患者男,35岁。2月前无明显诱因出现胸痛,无咳嗽、咳痰、痰中带血,伴有活动后气短症状。外院胸片示:左侧巨大胸腔占位;B超示:左侧胸膜腔内可探及范围约14cm×13.5cm囊实性肿物。入院查体:胸廓对称无畸形,肋骨无压痛,胸左上部叩诊为实音,双肺呼吸音清,左上肺呼吸音减弱,未闻及啰 Male patient, 35 years old. There was no obvious cause of chest pain 2 months ago, no cough, sputum, bloody sputum, and symptoms of shortness of breath after activity. The chest radiograph of the outer hospital showed: a large chest cavity on the left; the B-ultrasound showed that a cystic solid mass of about 14cm x 13.5cm was detectable in the left pleural cavity. Admission examination: Thoracic symmetry without deformity, ribs without tenderness, percussion in the upper left chest as a real sound, breath sounds in both lungs, breath sounds in the left upper lung weakened, and no hearing