IMAGE: Xray Chest PA and Lateral INDICATION: DESATURATION EPISODE OVERNIGHT, PLEASE EVALUATE FOR INFILTRATE; COMPARISON: Chest AP portable. XXXX. FINDINGS: There are XXXX opacities within both lung bases, XXXX representing atelectasis. Heart size is upper limits of normal. No pneumothorax. No pneumothorax. IMPRESSION: Bibasilar atelectasis. No pneumonia. .