Superior accessory fissure
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Sagittal images demonstrate thin line posterior to the right minor fissure, at the same plane and in a horizontal/oblique orientation. It looks like a continuation of the right minor fissure posteriorly, which separates right lower lobe into superior and inferior segments. Coronal images demonstrate a thin horizontal line projecting below and parallel to the right minor fissure. These findings are consistant with right superior accessory fissure.
Incidental finding of superior accessory fissure.