Rational Approach to a Unilateral Pleural Effusion

Inclusion Criteria

• •1. Patients with recurrent pleural effusion of unknown origin after a first pleural tap according to BTS guidelines.
• •2. Indication for thoracoscopy according to BTS guidelines.
• •3. Patients accept further investigation according to Danish and BTS guidelines.
• •4. Have received oral and written consent and agreed.
• •5. At the time of inclusion, above 18 years of age.