My mom has right Pleural effusion. She has undergone Truecut Biopsy and thoracoscopy of pluera, bronchoscopy of lungs and malignancy testing of Pleural fluid...all tests have come negetive. Then she has been diagnosed with papillary thyroid carcinoma. Is the  thyroid cancer causing the right pleural effusion?

Summarized question: Can papillary thyroid carcinoma cause pleural effusion?