From what I understand, IR and DR are very different from each other in terms of duties, patient interaction, and other aspects, yet IR is a fellowship added onto a DR residency. How does this work for someone who is interested in IR but not so much in DR? I'm aware that IR docs may do some DR duties, but the overlap does not seem all that significant. Is someone who is interested in IR but not so much in DR pretty much forced to go through the standard DR residency?