This fluid can be due to any trauma, obstruction of bile duct, infection, abscess, cirrhosis, autoimmune diseases, heart
failure etc.Pneumonia, kidney and
liver disease, heart
failure and autoimmune diseases all can have pleural effusion. A clinical correlation is very important for confirming the diagnosis.Discuss this report with your gastroenterologist and get your doubts clarified. I hope it helps. Keep me posted.
Take care and regards!