::After an edit conflict 
 :I've been on a fishing trip and just managed to steal my brother's laptop, so I've missed the excitement here.  I would like to just reiterate what I just said over at WT:VET, which is that I feel it is completely appropriate to have a photo of the surgical procedure.  For every person who may be turned off by he photo, there will be another who finds it informative.  However, the image of the recumbent castration is a bit of a concern to me due to the lack of gloves and the apparent lack of a sterile field, especially when the text says regarding recumbent castration, "better asepsis (sterile environment) can be maintained".  
 :Incidentally, I remember a discussion regarding medical images when keratoconus became an FA, including a discussion at the Village Pump.  See Talk:Keratoconus/Archive1#So Ugly for an example of reactions to a relatively benign image that was in an FA.