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Do you have any friends/peers that didn't match into neurosurgery? What did they end up doing? I'm apprehensive about doing only neurosurgery research as a med student in the event that I don't match--I assume general surgery program directors would be skeptical about an applicant who was obviously set on neurosurgery.
Great question. My experience has been that along the way, on some level, there are a fair number of people interested in pursuing neurosurgery as a career. The level of involvement and steps to properly position oneself vary, but here is a general overview from my experience.
M1/2: Much like undergrad does for pre-meds, the pre-clinical years help to stratify medical students. The great equalizer is Step-1, but before that many people are interested and shadow, do research etc. This interest can wane or intensify, and Step-1 can either make things easier or much, much harder. For example, a guy I did research with during the summer of M1/2 ended up matching in to a great IM program and is now doing a cards fellowship with only neurosurgery research. Others I know that stepped out along the way prior to or after rotations went in to surgery, EM or ENT.
M2/3: The whole game changes during M3 year. Aside from vague generalizations, many students have little to no exposure to clinical medicine, nor do they understand what different doctors do on a day to day basis, let alone for a career. Plenty of students catch the neurosurgery bug during 3rd year, and plenty match (even if it's late in 3rd year). I'll warn you though, don't go in to 3rd year shopping for a career. All too often someone will treat it like car shopping wherein they know their board score, the averages for specialties, and try to shoe-horn themselves in to something.
Post-match:
You gave it your all, crushed step-1, multiple letters from top programs, first author papers in relevant journals, or the opposite, yet didn't match. What to do from here? Based on what I've heard/experienced from friends/med students having to go through it this is what happens: 1) re-evaluate whether or not neurosurgery is for you. why are you interested in it, could something (anything) else suffice? are you being realistic? If you're still interested then go for it. 2) Most pre-lim surgery programs are very understanding of the mutual situation. Try to find one at a program that has a neurosurgery department. Work on establishing connections and a clinical track record of excellence. Continue the hard work that was done (publish, present, get to know people) and look for advanced position openings. 3) Pre-residency fellowship or clinical research are options. Both allow you to work closely with a department of neurosurgery and establish a track record as being a hard worker and someone they want to be with for 7 years. Both strengthen weak applications by adding to research or letters to your file. 4) Find something else. If it just isn't working out, work on a back-up plan in the meantime. Every surgeon has a plan for when things don't go right. This shouldn't be anything different. I have had friends who failed to match, scramble in to pre-lim gen-surg and end up in ENT, Plastics, ortho, anesthesia, radiology, and emergency medicine.
You found out you matched in the wrong field and want to switch from ortho/anesthesia/ent/neurology to neurosurgery. Work with the departments at your institution. Often there is a resident being fired or the program is expanding, perhaps you can slide right in. Keep your ear to the ground, openings at all levels do occur. In the meantime, keep your CV up to date and get letters together for an application when you do hear about an opening. Letters from your field are great, especially your chair or program director, but you really need neurosurgeons to write you letters. Try to rotate on the neurosurgery service if you have electives. Help the team out, residents (at some programs) can be the biggest advocates for a candidate.
TL/DR - Life is long, putting all of your eggs in to one basket does not mean you can't switch.