This is a single photographed chest X-ray, so it cannot replace an official radiology report. The image appears to show:

Most likely impression: Right-sided pleural effusion with adjacent right lower-lobe atelectatic change or pneumonia.

There is no obvious large pneumothorax. The left lung is relatively clear.

Please have the original image reviewed promptly by a radiologist/clinician, especially if there is fever, cough, breathlessness, chest pain, low oxygen level, or worsening symptoms. A lateral view, chest ultrasound, or CT may be needed to distinguish fluid from pneumonia/collapse. Chest X-ray findings must be interpreted together with symptoms and examination, since an infiltrate alone does not establish the cause. A recent review also notes the limitations of chest radiography for confirming pneumonia (2025 systematic review).