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Case of the Week 301 
What's the most likely diagnosis?
- 32 year old asthmatic with wheezing
- Pulmonary arterial hypertension
- Ewing sarcoma
- Pancoast tumor
- Pneumothorax
- Right middle lobe atelectasis
Additional Image-Lateral Chest
Additional Image
Lateral Image of Chest
Answer:
5. Right Middle Lobe Atelectasis
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Right Middle Lobe Atelectasis
General Considerations
- Right middle lobe is more prone to atelectasis because its bronchus has a narrow diameter, acute angle of take-off and a relatively lon course
- Causes of right middle lobe atelectasis include
- Asthma
- Cystic fibrosis
- Bronchopulmonary dysplasia
- Foreign body aspiration in the airway
- Tumors
- Primary endobronchial (i.e. bronchogenic carcinoma)
- Extrinsic compression from adenopathy
- Granulation tissue, as in TB
- Bronchopneumonia
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