Thic radiograph was shown to me by my collegue residents, on | Figure 1

Thic radiograph was shown to me by my collegue residents, only history that i know is that it is a 45 y.o. male with chronic renal failure. Unfortunatelly they didn't ask for lateral view radiograph. I have no idea what this radioopaque, oval structures could be?? I don't think that those are artefacts, looks to me more like something in soft tissue of chest, encapsulated larvae maybe?