Intrapulmonary lymph nodes

Last revised by Yuranga Weerakkody on 20 Jun 2023

Intrapulmonary lymph nodes, or pulmonary lymph nodes, are normal lymph nodes found within the lung parenchyma itself.


They are commonly found during the assessment of CTs of the chest and are, sometimes, difficult to distinguish from pulmonary nodules.

Some publications suggest at they may represent 24–44% of noncalcified nodules in a "lung cancer screening setting" 7 and may represent 1-66% (wide range) of all nodules on CT scan.


The pulmonary lymph nodes are divided into subtypes accordingly to their location:

Radiographic features

  • around 6 mm in size (usually reported range around 3-8.5 mm) 1

  • most tend to be below the carinal level (i.e. lower lobes and middle lobe 4)

  • nodules may be oval, round, triangular, trapezoidal or polygonal

  • may have sharply defined borders

  • tend to be solid and homogeneous and without calcification

  • some nodules may show a discrete thin tag extending to the pleura

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Cases and figures

  • Case 1: perifissural
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  • Case 2: perifissural
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