Bilateral pleural effusions and some ascites that was not there previously following a percutaneous liver bx. what exactly would be the cause?

Some malignancy: Not many lesions of the thoracic cage such as lung produce bilateral pleural effusion, some ascites and a metastatic focus in the liver. The most common abdominal lesion to behave in this fashion is ovarian Ca with metastasis. If you are not aware of a primary, liver bx and PET/CAT should resolve the issue so that proper treatment can be initiated.