Radiology doesn't actually have anything to do with Radiation Therapy/Treatment; that's generally considered part of Oncology. Radiology as a department has grown to become the catch-all for all of Medical Imaging, so things like Ultrasound, MRI and CT are all included.
My guess here is that they were planning a paracentesis (i.e. jabbing a needle in his belly very carefully) to drain the abscess, but after looking at images/data of where the abscess was located they decided there was no easy way to get to it.
My guess here is that they were planning a paracentesis (i.e. jabbing a needle in his belly very carefully) to drain the abscess, but after looking at images/data of where the abscess was located they decided there was no easy way to get to it.