RCP 600 CH.6 X RAYS | QUESTIONS WITH VERIFIED
ACCURATE ANSWERS | 2026
1. Where should the tip of an endotracheal tube (ETT) be positioned on a chest X-ray? -
Answers - - The tip should be in the mid-tracheal region, between the thoracic inlet
(superior boundary) and the carina (inferior boundary).
- In pediatric patients, aim for placement below the 1st rib and above the 4th rib.
- Note: Head flexion advances the tube, while extension retracts it.
2. What is the "thumb sign" on a lateral neck radiograph, and which condition is it
associated with? - Answers - - The thumb sign is a swollen, rounded epiglottis visible on
lateral X-ray, resembling a thumb protruding into the airway.
- Associated with epiglottitis, a life-threatening emergency requiring immediate airway
intervention.
3. What is the "steeple sign," and which disease process shows this finding? - Answers
- - The steeple sign is subglottic narrowing on a frontal neck X-ray, creating a tapered,
steeple-like tracheal shape.
- Pathognomonic for croup (laryngotracheobronchitis), a viral upper airway obstruction
in children.
4. Why are forced expiratory images used in pediatric chest radiography? - Answers - -
To detect air trapping from foreign body aspiration or partial bronchial obstruction.
- On expiration, the obstructed lung remains hyperinflated, while the normal lung
deflates, revealing asymmetry.
- Enhances sensitivity for diagnosing foreign bodies or pneumothorax.
5. How does a pneumothorax appear on a chest X-ray? - Answers - - Peripheral
radiolucency(BLACK) (dark area) without lung markings.
- Visible edge of the collapsed lung (white line retracted inward).
- In tension pneumothorax: Mediastinal shift away from the affected side.
6. What is the "spinnaker sail sign," and which air leak syndrome does it indicate? -
Answers - - A sail-shaped radiolucency anterior to the heart on chest X-ray.
- Indicates pneumomediastinum (air in the mediastinum), often seen in neonates with
barotrauma.
7. What potentially life-threatening complication can occur with pneumopericardium? -
Answers - - Cardiac tamponade: Air in the pericardial sac compresses the heart,
impairing filling and leading to cardiovascular collapse.
- Requires emergent pericardiocentesis or drainage.
ACCURATE ANSWERS | 2026
1. Where should the tip of an endotracheal tube (ETT) be positioned on a chest X-ray? -
Answers - - The tip should be in the mid-tracheal region, between the thoracic inlet
(superior boundary) and the carina (inferior boundary).
- In pediatric patients, aim for placement below the 1st rib and above the 4th rib.
- Note: Head flexion advances the tube, while extension retracts it.
2. What is the "thumb sign" on a lateral neck radiograph, and which condition is it
associated with? - Answers - - The thumb sign is a swollen, rounded epiglottis visible on
lateral X-ray, resembling a thumb protruding into the airway.
- Associated with epiglottitis, a life-threatening emergency requiring immediate airway
intervention.
3. What is the "steeple sign," and which disease process shows this finding? - Answers
- - The steeple sign is subglottic narrowing on a frontal neck X-ray, creating a tapered,
steeple-like tracheal shape.
- Pathognomonic for croup (laryngotracheobronchitis), a viral upper airway obstruction
in children.
4. Why are forced expiratory images used in pediatric chest radiography? - Answers - -
To detect air trapping from foreign body aspiration or partial bronchial obstruction.
- On expiration, the obstructed lung remains hyperinflated, while the normal lung
deflates, revealing asymmetry.
- Enhances sensitivity for diagnosing foreign bodies or pneumothorax.
5. How does a pneumothorax appear on a chest X-ray? - Answers - - Peripheral
radiolucency(BLACK) (dark area) without lung markings.
- Visible edge of the collapsed lung (white line retracted inward).
- In tension pneumothorax: Mediastinal shift away from the affected side.
6. What is the "spinnaker sail sign," and which air leak syndrome does it indicate? -
Answers - - A sail-shaped radiolucency anterior to the heart on chest X-ray.
- Indicates pneumomediastinum (air in the mediastinum), often seen in neonates with
barotrauma.
7. What potentially life-threatening complication can occur with pneumopericardium? -
Answers - - Cardiac tamponade: Air in the pericardial sac compresses the heart,
impairing filling and leading to cardiovascular collapse.
- Requires emergent pericardiocentesis or drainage.
