Patient: My brother, 37 years old, had shortness of breath, coughing and difficulty sleeping on June 18, and was admitted to the hospital for examination of pleural fluid. How to treat? Zhao Jun, Department of Thoracic Oncology, Beijing Cancer Hospital: The accuracy of cytology diagnosis of pleural fluid is poor, so it is recommended to consult cytology smear in a specialized hospital. If the diagnosis cannot be confirmed, it is recommended to perform thoracoscopic biopsy.