Examkin

Question

Difficulty: EasyInterpreting Imaging Results

A 22-year-old tall, thin man presents to the emergency department with sudden-onset right-sided chest pain and shortness of breath that began while he was resting at home. His temperature is 37.0°C (98.6°F), blood pressure is 120/78 mmHg, heart rate is 105/min, and respiratory rate is 22/min. Oxygen saturation is 96% on room air. Physical examination reveals decreased breath sounds and hyperresonance to percussion over the right hemithorax. An upright portable chest radiograph reveals a thin, white visceral pleural line separated from the parietal pleura by a radiolucent space devoid of lung markings in the right upper hemithorax. The mediastinum remains strictly in the midline. Based on these radiographic findings, what is the most likely diagnosis?

  1. Spontaneous pneumothoraxAnswer
  2. B
    Tension pneumothorax
  3. C
    Pulmonary embolism
  4. D
    Lobar pneumonia
  5. E
    Pleural effusion

Answer

Spontaneous pneumothorax
The correct answer is spontaneous pneumothorax. The classic radiographic hallmark of a pneumothorax is the visualization of the visceral pleural line, which appears as a thin white line separated from the parietal pleura (chest wall) by a radiolucent (dark) space that completely lacks pulmonary vascular markings. The absence of a contralateral mediastinal shift indicates that this is a simple, non-tension pneumothorax, which perfectly correlates with the patient's stable hemodynamics and classic demographic profile (young, tall, thin male).

Step-by-Step Solution

1
Analyze the patient's demographics and clinical presentation.
The patient is a tall, thin young man with acute right-sided pleuritic chest pain and dyspnea, accompanied by decreased breath sounds and hyperresonance.
These are the classic demographic and physical examination hallmarks of a primary spontaneous pneumothorax.
2
Interpret the radiographic findings provided in the stem.
The chest radiograph shows a visceral pleural line with an absence of peripheral lung markings and no mediastinal shift.
Identifying the visceral pleural line separated from the chest wall by radiolucent air confirms the presence of air in the pleural space (pneumothorax).
3
Differentiate between a simple and tension pneumothorax based on imaging.
The midline position of the mediastinum indicates a simple spontaneous pneumothorax, ruling out tension physiology.
Tension pneumothorax requires immediate clinical intervention and is characterized radiographically by a shift of mediastinal structures away from the affected side.

Key Concept

Identification and interpretation of simple pneumothorax on a chest radiograph.
Estimated Time:45s
Rate this question

Topics

Interpreting Imaging Results

More questions from this topic