Making distinctions: the contribution of Hector Landouzy to differential diagnosis in relation to hysteria and epilepsy

Hector Landouzy (1818-1864) is known for his Traité Complet de l'Hystérie (1846), which was crowned by the Académie de Médecine, but this work is not given much importance in historical accounts. It deserves more attention because it was more than an orthodox statement about the nature of hysteria. In the context of the diagnostic confusion between epilepsy and hysteria, it introduced a method of presenting criteria to facilitate diagnosis. An examination of French authors on epilepsy and hysteria in the second half of the nineteenth century suggests that this method probably set the example which was to be followed by later clinicians, including Charcot at the Salpêtrière.