Conclusions:Accurate X-ray diagnosis of subpulmoonic effusion was v aluabl e for early diagnosis and prompt treatment of patients with pleural metastasis.

• 结论：熟悉肺底积液的X线诊断和鉴别诊断，对肿瘤患者胸膜转移的早期诊断、及时治疗有重要意义。