Multidetector CT for Evaluation of the Extrapleural Space.

Area of Science:

• Thoracic imaging and anatomy
• Radiology
• Chest pathology

Background:

• The extrapleural space (EPS) is an often-overlooked anatomic region within the chest wall.
• It contains adipose tissue, lymph nodes, and vessels, lying between the ribs and parietal pleura.
• Conventional radiography frequently misses EPS abnormalities, unlike cross-sectional imaging.

Purpose of the Study:

• To review the normal and abnormal appearances of the EPS on thoracic computed tomography (CT).
• To highlight the importance of recognizing EPS abnormalities in various disease processes.
• To provide a differential diagnosis for findings within the EPS.

Main Methods:

• Review of thoracic CT scans demonstrating normal and pathologic EPS.
• Correlation of imaging findings with clinical conditions.
• Discussion of characteristic CT features of EPS abnormalities.

Main Results:

• Extrapleural fat proliferation can mimic pleural thickening or effusion on radiography.
• CT findings differentiate extrapleural hematoma from hemothorax, guiding treatment.
• Extrapleural air requires distinction from pneumothorax for appropriate management.
• Neoplasms can alter EPS fat attenuation due to inflammation or invasion.

Conclusions:

• Knowledge of normal EPS anatomy on CT is vital for detecting abnormalities.
• Common EPS pathologies include inflammation, infection, trauma, and neoplasms.
• Accurate diagnosis of EPS conditions on CT impacts patient management and treatment strategies.