Intralobar sequestration differs from extralobar sequestration in that intralobar sequestration shares which anatomical feature?

• A. Shares the same pleura as the lung
• B. Has its own pleural covering
• C. Is outside the lung
• D. Is always in the neonatal period

Answer: (A)

The main idea is that the pleural investment distinguishes intralobar from extralobar sequestration. Intralobar sequestration is embedded within a normal lung lobe and shares the same visceral pleura with the adjacent lung, so it does not have its own separate pleural covering. This is why the statement about sharing the same pleura is correct. Extralobar sequestration, in contrast, has its own distinct pleural covering and lies outside the lung tissue. It’s not restricted to the neonatal period—though it can be seen in infancy—so that option isn’t reliable for defining intralobar sequestration.