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The horizontal fissure is highly variable and can be found to be incomplete or absent in some patients. According to different postmortem dissection studies, the prevalence of incomplete horizontal fissures can vary between 8-35% and may be absent in 3-50% of the patients' right-sided lungs 2,3,4.
A minority of individuals have a horizontal fissure in the left lung, independently of the right horizontal fissure.
The horizontal fissure can be visualized on both conventional radiography and computed tomography (CT) scans.
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