Topics

Topic

design image
Paratracheal lymph nodes

Paratracheal lymph nodes are a group of mediastinal lymph nodes located along the lateral aspects of the trachea, extending from the thoracic inlet to the carina. They are divided into right and left paratracheal chains, lying adjacent to the tracheal wall and anterior to the scalene muscles in the superior mediastinum, and alongside the superior vena cava on the right and the aortic arch on the left. These nodes receive lymphatic drainage from the larynx, thyroid, esophagus, trachea, and lungs, and primarily drain into the bronchomediastinal lymph trunks. Paratracheal lymph nodes play a key role in thoracic and upper mediastinal lymphatic circulation, acting as sentinel nodes for infections, inflammatory processes, and malignancies in the head, neck, and thorax.

Synonyms

  • Superior mediastinal lymph nodes

  • Lateral tracheal lymph nodes

  • Right and left paratracheal nodes

Function

  • Filter lymph from the trachea, esophagus, thyroid, larynx, and lungs

  • Initiate immune responses by trapping pathogens and foreign particles

  • Serve as key nodes in thoracic lymphatic drainage

  • Act as sentinel nodes in mediastinal infections and thoracic malignancies

MRI Appearance

T1-weighted images:

  • Normal paratracheal lymph nodes appear as small, oval, hypointense to intermediate signal structures adjacent to the tracheal wall

  • Surrounded by intermediate signal mediastinal fat, providing natural contrast

  • Pathological nodes may appear enlarged, rounded, or demonstrate cortical thickening

T1 Post-Contrast (Gadolinium-enhanced):

  • Normal nodes may show mild homogeneous enhancement

  • Enlarged or pathological nodes demonstrate marked homogeneous or heterogeneous enhancement, highlighting the cortex and fatty hilum

  • Post-contrast imaging is useful for detecting metastatic nodes, lymphoma, or inflammatory enlargement

T2-weighted images:

  • Nodes show intermediate signal, while surrounding fat and mediastinal structures appear hyperintense

  • Useful for detecting edema, inflammatory infiltration, or cystic changes

  • Fatty hilum may appear slightly hyperintense relative to cortex

STIR (Short Tau Inversion Recovery):

  • Fat suppression improves visualization of edema, inflammation, or neoplastic infiltration

  • Normal nodes remain low-to-intermediate signal, while pathological nodes appear bright hyperintense

CT Appearance:

  • Nodes appear as small, soft tissue density structures lateral to the trachea

  • Surrounded by air within the tracheal lumen, providing natural hypodense contrast

  • Enlarged or pathological nodes appear as well-defined or irregular soft tissue masses

  • CT is particularly useful for preoperative planning, evaluating thoracic infections, staging lung cancer, and detecting metastatic disease

MRI images

Paratracheal lymph nodes mri axial image -img-00000-00000