Situs inversus (https://www.theguardian.com/science/blog/2016/sep/08/situs-inversus-and-my-through-the-looking-glass-body) (=having a 'mirrored' anatomy)
***possibly triggering for "why doesn't anybody belief what I tell them?"***
Synopsis:
QuoteI was diagnosed with situs inversus totalis at six months old. Often, recorded signs of a reversed anatomy are dismissed as an error of the x-ray technician, the left and right labels supposedly mixed-up. It was only when I was taken to hospital with unrelated breathing problems that doctors began to consider the possibility that I had situs inversus. "Sit down and listen to everything I tell you", the doctor told my parents, who, even after listening intently, were left in a state of disbelief. Several medical staff hurried into the room, excited. Medics may only come across one case of situs inversus in their careers, and I was later invited to take part in a Guess What's Wrong With The Baby trainee doctor event.
(text formatting mine)