A 28-years old woman, working as a secretary, developed a rapidly progressive paraplegia with burning pain in the lower limbs. She recovered within 4 months but relapsed shortly after she was discharged. There was flaccid tetraplegia, associated with hyperalgesia of the limbs, diffuse muscle atrophy, blindness and alopecia. The patient needed respiratory assistance for 2 months. Bilateral optic neuropathy and paraparesis persisted after a 17 months follow-up. The clinical picture suggested thallium poisoning, which was confirmed by high thallium concentration in plasma and urine. The most likely cause was accidental poisoning with rodenticides.