Radiology, Part 2

Question 1

Lung collapse, what happens

Answer 1

Lung density increases
Volume diminishes
Adjacent structures move toward the collapsed structure.

Question 2

Relative hilar positions

___ is higher than the ___ side.

Answer 2

In 97% of individuals, the left hilum is slightly higher than the right.

This is opposite of the diaphragms, in which the right diaphragm is generally higher than the left due to the liver.

Question 3

Compensatory hyperinflation

Answer 3

Volume loss usually changes the density of the lung.

The airless atelectatic lung is more radiopaque.

Adjacent lobes may hyperinflate to fill the void. Aiding the aerated lobes to be more radiolucent.

Question 4

Causes of central obstruction, by age:

Children …
Adults younger than 40 …
Adults older than 40 …

Answer 4

Central obstruction = Endobronchial obstruction

Children: mucous plug or aspirated foreign body.
Adults 40 YO: bronchogenic carcinoma

Question 5

Direct signs of lobar collapse

Answer 5

Fissure movement
Crowded markings
Movement of marker structures

Crowding of pulmonary vessels or bronchi, movement of parenchymal landmarks (e.g.m nodules, granulomas, surgical clips) can also indicated volume loss.