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Flashcards in Radiology Deck (19):
1

Air bronchogram sign

air bronchogram sign

Radiographic appearance of an air-filled bronchus as it passes through an area of increased anatomic density, as in pulmonary edema and pneumonia.

2

Silhouette sign

The obscuring of normal radiographic images due to changes in density of surrounding tissues. What can normally be seen, cannot.

3

Radiolucent

Penetrable by x-rays.

On an x-Ray, the darker areas.

4

CT value of tissues and other substances:

Pure air ...
Pure water ...
Lung ...
Fat ...
Fluid ...
Muscle ...
Liver ...
Bone ...

CT value of tissues and other substances:

Pure air ... -1,000
Pure water ... 0
Lung ... -800
Fat ... -1,200
Fluid ... 0
Muscle ... 40
Liver ... 40
Bone ... 350

5

Azygos fissure, location and in the same plane as ___ fissure plus definition.

Right medial lobe
In the same plane as the inferior accessory fissure.

The azygos fissure is the most common accessory fissure seen on chest x-ray. The azygos vein usually runs horizontally along the right of the mediastinum. It hooks forward over the right main bronchus, draining the azygos system into the superior vena cava.

If there is an azygos fissure, the vein appears to run within the lung, but is actually surrounded by both parietal and visceral pleura. The azygos fissure therefore consists of four layers of pleura, two parietal layers and two visceral layers, which wrap around the vein giving the appearance of a tadpole.

Source: radiologymasterclass.co.uk

6

Inferior accessory fissure, location and in the same plane as ___ fissure plus definition.

Right lower lobe
In the same plane as the azygos fissure

The inferior accessory fissure, also known as Twining's line, divides the medial basal bronchopulmonary segment from the rest of the lower lower. This accessory fissure occurs in 5 - 8% of frontal chest x-rays and if approximately five times more common on the right than the left.

7

Superior accessory fissure, location and in the same plane as ___ fissure plus definition.

Right lobe
In the same plane as the minor accessory fissure.

The superior accessory fissure is seen on approximately 10% (range 9 - 22%) of chest x-rays and may be more common in fetuses and neonates.

The superior accessory fissure of the right lobe of the lung is located in the same plane and posterior to the right minor fissure. It separates the right lower lobe into superior and basal segments. This superior segment is called the posterior or dorsal lobe.

Frontal chest x-rays demonstrate a thin horizontal linear opacity projecting below expectations, parallel, and medial to the right minor fissure. Lateral radiograph demonstrates thin line posterior to the right minor fissure, usually in the same plane and in a horizontal or oblique orientation. It may look like a continuation of the right minor fissure posteriorly, which separates right lower lobe into superior and inferior segments.

8

Minor fissure, location and in the same plane as ___ fissure plus definition.

Right lobe
In the same plane as the superior accessory fissure

FINISH, NEEDS DEFINITION

8

What planes and x-ray views can the ____ fissure be observed?

Major fissure

Major:
Planes - axial, sagittal
X-ray - lateral

9

What planes and x-ray views can the ____ fissure be observed?

Minor fissure

Minor:
Planes - frontal, sagittal
X-rays - PA, lateral

10

What x-ray views can the ____ fissure be observed?

Azygos fissure

X-rays- PA

11

What x-ray views can the ____ fissure be observed?

Inferior accessory fissure

PA

12

What x-ray views can the ____ fissure be observed?

Superior accessory fissure

X-ray: PA and lateral

13

X-Ray densities

Air
Fat
Tissue (waters)
Bone (metal)

14

Silhouette sign, contacting structures:
The ____ lobe contacts ____

Left lower lobe

Left diaphragm
Descending aorta

15

Silhouette sign, contacting structures:
The ____ lobe contacts ____

Right middle lobe

Right heart border

16

Silhouette sign, contacting structures:
The ____ lobe contacts ____

Lingula

Left heart border

17

Silhouette sign, contacting structures:
The ____ lobe contacts ____

Right upper lobe

Ascending aorta

18

Silhouette sign, contacting structures:
The ____ lobe contacts ____

Left upper lobe

Left atrium
Left mediastinal border
Aortic knob (sometimes)