Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Assessment of the chest is somewhat limited by patient positioning , low lung volumes , and the patient 's chin and neck obscuring the left apex . The cardiac silhouette size remains mildly enlarged . Mediastinal and hilar contours are grossly unchanged . Crowding of bronchovascular structures is due to low lung volumes without overt pulmonary edema . Patchy retrocardiac opacity likely reflects atelectasis , however infection is not excluded in the correct clinical setting . No pleural effusion or large pneumothorax is identified . A percutaneous gastrostomy catheter projects over the left upper quadrant of the abdomen .
    OUTPUT:
    
Limited examination . Patchy retrocardiac opacity may reflect atelectasis however infection is not excluded in the correct clinical setting .