No pleural mass in chest CT scan, clear pleural exudate (lab results say it is exudate not transudate).No fever or cough. Can we rule out lung cancer?

Not enough info.... With the information provided, lung cancer cannot be ruled out. Need to know if any mass or abnormality was seen on the chest CT scan. An exudative pleural effusion could be due to many things including pneumonia, cancer, etc. A sample of the fluid should be sent for a variety of cultures as well as looked at for malignant cells. More testing is definitely needed for a diagnosis to be made! .