Fig. 13
![Fig. 13](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs13244-019-0789-4/MediaObjects/13244_2019_789_Fig13_HTML.png)
Fleischner sign. The “Fleischner sign” consists of a prominent central pulmonary artery upstream of cutoff (white arrows in a, black asterisk in b). It is frequently caused by a large embolus into the central pulmonary artery, as well depicted on axial CT image of the same patient (c, white arrowhead)