Vascular strikes me as a waste of time. Perhaps it's just my non-interest in the field talking, but general neurologists see so much stroke that I have to ask how much more training you need in order to look at an MRI and prescribe aspirin?

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This is a ridiculous comment. You do not need vascular neurology or even general neuro training to prescribe aspirin. Even a primary care physician can look at the 'radiology report' and prescribe aspirin in his/her office. But you need 'vascular neurology' training to 'treat' strokes in this day and age. There is much more to acute stroke treatment than looking at plain CT/MRI and giving ASA, even more than IV TPA within 3 hours. Treating strokes at a large center (academic or community) requires being able to interpret advanced neuroimaging, utilize vascular ultrasound with clinical decision making to initiate intravenous or endovascular thrombolytic therapy. In 'general neuro', you have enough time in the clinic to do a 'literature search' and scratch your head and end up prescribing steroids. In the 21st century, telemedicine has ensured that stroke docs 'treat' strokes as a full time job. In the ER, you have to analyze CT or MRA/perfusion studies all the time depending on where you are (many times even post-process raw perfusion images) and also utilize added info from vascular ultrasound to treat strokes. And yes, there are billing codes for all these. You do not look at radiology reads to make clinical decisions. Many stroke docs are moving into endovascular as well. Even if you choose to stay non-invasive, it is a full time job that needs separate training and certification. Like any field, the initial experts always grandfathered into this, but all new guys need to get trained through a specified pathway. Yes, if you are in the middle of nowhere, then you can pretty much be the 'neuro' guy for strokes. Internists can read ECGs too and theoretically know how to manage MI but cannot do it in real life.
In the outpatient stroke clinics you also get to see pts with complicated intra and extracranial stenosis and evaluate regarding further treatment.
Even JCAHO mandates that stroke centers need physicians certified in 'vascular neurology'. Many states (MA, TX, FL,..) already have laws that mandate that EMS take acute stroke pts 'not to the nearest ER, but the nearest stroke center', other states are in the process of making these laws. This is making telemedine very useful and stroke docs evaluate and 'treat' strokes full time. Also remember that of all neurologic illnesses, stroke has the largest healthcare burden.
Being certified in 'vascular neurology' with advancing cerebrovasc medicine is extremely useful.