Advanced Thorax Lymphatic Drainage Quiz

Q1. Why can lymph from a lung reach tracheobronchial nodes on the opposite side?

• The two pleural cavities normally communicate freely
• Pulmonary lymph first enters inguinal nodes
• Central tracheobronchial pathways have cross connections
• Each lung has a completely isolated lymphatic system

Q2. Why is the carina an important landmark when evaluating thoracic lymphatic spread?

• Inferior tracheobronchial nodes are concentrated around the bifurcation
• Parasternal nodes lie inside the tracheal lumen
• The thoracic duct begins inside the carina
• The cisterna chyli lies at the carina

Q3. What is the usual relationship of the thoracic duct to the esophagus in much of the posterior mediastinum?

• It remains anterior to the sternum
• It passes through the right atrium
• It runs inside the esophageal lumen
• It ascends posterior to the esophagus

Q4. How can thoracic duct injury lead to chylothorax?

• The trachea ruptures directly
• The pulmonary artery opens into the pleura
• Chyle can leak from the injured duct into the pleural cavity
• Bile enters the pleural cavity through the duct

Q5. Which relationship is useful for identifying the thoracic duct in the lower posterior mediastinum?

• It remains lateral to the parietal pleura
• It lies between the azygos vein and descending aorta behind the esophagus
• It lies between the sternum and skin
• It runs inside the left main bronchus

Q6. Why can medial breast malignancy spread to contralateral parasternal nodes?

• Both breasts share a single fibrous capsule
• All breast lymph first enters the thoracic duct
• Axillary nodes pass directly through the sternum
• Parasternal lymphatic channels can communicate across the midline

Q7. How does lymphatic drainage of visceral pleura differ from much of the parietal pleura?

• Parietal pleura drains only into pulmonary veins
• Visceral pleura follows pulmonary pathways while parietal pleura follows regional wall pathways
• Visceral pleura has no lymphatic vessels
• Both drain exclusively to inguinal nodes

Q8. What can happen to the right bronchomediastinal trunk when a distinct right lymphatic duct is absent?

• It becomes a branch of the azygos vein
• It must enter the thoracic duct on the left
• It terminates in the portal vein
• It may terminate independently at the right venous angle

Q9. What explains the basic right-left asymmetry of terminal thoracic lymphatic drainage?

• The right lung lacks lymphatic vessels
• The left thorax drains only to the inferior vena cava
• The right upper quadrant and thoracic duct occupy different terminal drainage territories
• Both sides always enter one identical lymphatic duct

Q10. Which statement best integrates regional lymphatic drainage of the thorax?

• All thoracic lymph first enters inguinal nodes
• All thoracic lymph drains exclusively through the right lymphatic duct
• Thoracic lymph bypasses lymph nodes entirely
• Regional nodes feed central trunks that return lymph to the venous angles