Chest X Rays

Question 1

What are Kerley B lines?

Answer 1

Thickened, edematous interlobular septa. Causes include; 1. pulmonary edema

2. lymphangitis carcinomatosa
3. malignant lymphoma
4. viral and mycoplasmal pneumonia
5. interstitial pulmonary fibrosis

Question 2

What is the silhouette sign?

Answer 2

Elimination of silhouette of soft tissue caused by a mass or fluid in the normally air filled lung
- EG: an intrathoracic opacity is in anatomic contact with the heart border obscuring its border

Question 3

What is an air bronchogram?

Answer 3

The tubular outline of an airway being made visible by filling of surrounding alveoli by fluid

Question 4

What volume is needed to make a pleural effusion visible on cxr?

Answer 4

250 ccs

Question 5

What is the meniscus sign?

Answer 5

Crescent of gas near top of a mass lesion, signifying cavitation with a space above debris
- Seen in aspergilloma

Question 6

What type of cancer do multiple masses indicate?

Answer 6

Metastatic

Question 7

What is a pneumothorax?

Answer 7

-Air between visceral and parietal pleura

Question 8

Which way does mediastinum move in tension pneumothorax?

Answer 8

Towards the good lung (away from the pneumo)