Expanding upon the unilateral hyperlucent hemithorax in children

Area of Science:

• Pediatric Radiology
• Thoracic Imaging
• Diagnostic Imaging

Background:

• Unilateral hyperlucent hemithorax is a frequent observation on pediatric chest radiographs and CT scans.
• This finding can stem from diverse congenital or acquired pathologies affecting lung tissue, airways, vasculature, pleura, chest wall, or even technical imaging artifacts.
• A wide spectrum of conditions, including emphysematous changes, pneumatoceles, foreign body aspiration, Swyer-James syndrome, and congenital lung abnormalities, can manifest as unilateral hyperlucency.

Purpose of the Study:

• To review the differential diagnoses for unilateral hyperlucent hemithorax in children.
• To emphasize the importance of accurate interpretation for appropriate patient management.
• To highlight the need to distinguish true hypoattenuation from relative hyperattenuation of the contralateral side.

Main Methods:

• Review of radiographic and CT findings associated with unilateral hyperlucent hemithorax.
• Analysis of the etiological spectrum, encompassing both intrinsic lung diseases and extrinsic factors.
• Discussion of diagnostic challenges and key imaging features.

Main Results:

• Unilateral hyperlucent hemithorax has a broad differential diagnosis, ranging from benign to life-threatening conditions.
• Accurate assessment requires differentiating true lucency from contralateral opacity.
• Recognizing the underlying cause is crucial for clinical decision-making.

Conclusions:

• Radiologists must be aware of the extensive differential diagnoses for unilateral hyperlucent hemithorax.
• Distinguishing true lucency from relative opacity is paramount for correct diagnosis.
• Timely and accurate diagnosis facilitates appropriate patient management and clinical outcomes.