CTICasesSuperior Accessory Fissure
Imaging findings
On the lateral chest radiograph a subtle thin white line is seen contiguous with a pleural surface. CT confirms this represents an accessory fissure separating the superior segment of the right lower lobe from the basal segments, with a slightly atypical course compared with a typical superior accessory fissure.
Key takeaways
A thin linear opacity contiguous with the pleura on the lateral radiograph, separating the superior segment from the basal segments of the lower lobe on CT, represents a superior accessory fissure -- a normal anatomic variant that should not be mistaken for a pathologic line or scar.
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