Mechanisms

• Pleural effusion
• CHF
• Pneumonia
• Emphysema
• Atelectasis
• Pulmonary nodule
• Diverticular disease
• Appendicitis
• Bowel obstruction
• Abdominal aortic aneurysm
• Pancreatitis
• Intra-abdominal abscess
• Hepatic mass
• Renal mass
• Pancreatic mass