Figure 8a. Lymphadenopathy. (a) On a collimated posteroanterior chest radiograph, the right paratracheal stripe is not seen, having been obliterated by a right paratracheal mass (arrowheads). (b) CT scan demonstrates right paratracheal lymphadenopathy (arrow), which obliterates the air–soft tissue interface between the right lung and the tracheal wall. This finding explains the obliteration of the right paratracheal stripe in a.