Triangular area of subsegmental collapse is seen in right middle lobe. Note is made of azygos fissure on right side. Rest of the lungs are normal in architecture and attenuation. Trachea, major bronchial divisions and mediastinal great vessels appear unremarkable. No evidence of significant mediastinal/ hilar lymphadenopathy. No evidence of any pleural effusion/ thickening seen. Cardiac size is normal with apparently normal configuration. No obvious pericardial collection seen. Chest wall structures appear unremarkable. IMPRESSION: - Triangular area of subsegmental collapse in right middle lobe. - No evidence of any active infection. What treatment should we go for