Advantages:
? You get the opportunity to spend one full year learning real medicine. Sorry, I couldn't resist. 😉
? If you don't match into Radiology and you decide to go into IM, you can start as a PGY-2 rather than a PGY-1.
Disadvantages:
? A Radiology program whose intern has done a prelim in medicine will have one less year of full payment from Medicare's Direct Graduate Medical Education (DGME) fund when compared to a TY intern.
? You are forced to suffer through one year in Internal Medicine. 🙁
When you apply for internship and residency at the same time, the program doesn't really know which type of internship you will match into. However, if you are scrambling or reapplying during your internship, they will know what type of internship you are doing. Therefore, they could favor one applicant over another due to funding.