Bit late to this thread but hey.
I'm quite interested in an O&G career - attachment was fab, and it's a great specialty with lots of new developments. There are however lots of drawbacks, which is why O&G is currently struggling to recruit british grads (I was basically told i'd have little problem getting a training post by the consultants where I did my attachment). It's the most highly litigated field, very unsociable hours etc etc. At the moment, the variety appeals to me, however, training is changing so much, and O&G are likely to become separate specialties.
Not sure I could do bog standard gynae - TAH, Vag Hys', and TVTs would become rather tedious! Gynae oncology on the other hand is very interesting.
Fertility also an interesting and developing field.
As for the madwife (sorry, i mean midwife) debate - Experiences will obviously vary, but the midwife way of doing things is very 'non-interventional' and anti-doctor. When things go wrong in obs, they have the potential to go very wrong (something I've seen). The whole 'natural' debate is all good and well, however, if you compare neonatal mortality rates around the world, the overriding determining factor is availability and quality of obstetric care.
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Medical imaging is radiology.