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Lung fissures

Last revised by Dr Daniel J Bell on 05 Jun 2020

Lung fissures are a double-fold of visceral pleura that either completely or incompletely invaginate lung parenchyma to form the lung lobes. 

Each lung has an oblique fissure separating the upper lobes from the lower lobes and the right lung has a horizontal fissure that separates the right upper lobe from the middle lobe

There are numerous accessory fissures that are common anatomical variants. 

See also

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Cases and figures

  • Figure 1
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  • Case 1: normal appearance on chest CT
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