Hi ! this is doctor Herisa reading your question. Pleural effusion means an abnormal amount of fluid around your lung, which according to your X-ray is present in both sides left and right but in minimal amount. Pleural effusions can result from many medical conditions and in your case it is due to the pneumonia which refers to inflammation of lung tissue. As the X-ray suggests it is located in the right side. the rest of the describtion is normal. I can say it suggests a type of pneumonia (may be bacterial, viral, atypical) can be associated with a parapneumonic pleural effusion. Effusions with pleural fluid layering less than 10 mm on decubitus chest radiographs almost always resolve with appropriate systemic antibiotics. Feel yourself free to write about your complains. Take care and remember that the treatment of pneumonia is very important. Best regards