- CT chest - a few days earlier
What is the opacity in the lower zone of the left pleural cavity?
Pig-tail catheter used to partially drain the effusion (did you notice the effusion on the chest x-ray was smaller than on this CT?).
Coronal reformats of a CT of the chest obtained a few days earlier demonstrates that the opacity in the left upper zone is due to encysted fluid in the superior part of the oblique fissure.