Presenting the last case before Summer vacation. Muppet needs quality time to replenish his energy (July and August) and will return in September with more interesting (and teaching) cases.
These radiographs belong to a 52-year-old male with a cough. The answer has now been added, but you can still leave your thoughts and diagnosis in the comments section, below, before you check it.
1. Mediastinal fat
2. Dilated SVC
4. None of the above