I didn’t have to be a medical student to recognise that this tooth, entwined in long hair drifting in the liquid-filled vitrine, was out of place – so much so, that the sight of it provoked an immediate and simultaneous sense of revulsion and fascination. The term teratoma is derived from the Greek, tera, meaning monster, and literally means “monstrous growth”; it was easy for me to see how such biological anomalies could become the stuff of nightmares.