CT of the thoracic duct

Area of Science:

• Radiology
• Anatomy
• Medical Imaging

Background:

• The thoracic duct is a critical lymphatic vessel in the thorax.
• Understanding its normal anatomy is essential for diagnosing diseases of the posterior mediastinum and thoracic outlet.

Purpose of the Study:

• To investigate the capability of computed tomography (CT) in demonstrating the normal anatomy of the thoracic duct.
• To assess the visualization of both opacified and non-opacified thoracic ducts using CT.

Main Methods:

• Lymphangiography was performed on 20 patients with normal chest films.
• CT scans were analyzed to evaluate the opacified thoracic duct from its origin to its venous confluence.
• CT was also used to assess the detection rate of the non-opacified thoracic duct in 80 patients.

Main Results:

• The entire opacified thoracic duct, including its arch, was easily imaged in all patients after lymphangiography.
• Variations in the duct's arch were noted.
• The non-opacified thoracic duct was visualized in part or totality in 81% (lower), 54% (mid), and 69% (upper) of subjects.
• The duct's arch was displayed in 57% of cases without opacification.

Conclusions:

• CT is highly effective in demonstrating the normal anatomy of the thoracic duct, both opacified and non-opacified.
• Knowledge of thoracic duct anatomy visualized by CT is vital for identifying pathologies in the posterior mediastinum and thoracic outlet.