Extensive soft tissue gas with associated fluid and stranding in the floor of the mouth, anterior neck, slightly extending into the right base of the neck, and extensively throughout the upper and anterior mediastinum. Associated small pericardial effusion. Small bilateral pleural effusions with bibasilar atelectasis. A small amount of nonocclusive thrombus within the superior vena cava. Right mandibular molar caries with periapical lucencies.