[Longitudinal Melanonychia and Hydroxyurea] A patient with chronic myeloid leukaemia was treated with hydroxyurea and developed longitudinal melanonychia on 10 of 20 nails. Such intense lesions are extremely rare.
Pirard, C., Michaux, J., & Bourlond, A. (1994). Mélanonychie en bandes longitudinales et hydroxyurée. Annales de Dermatologie et de Venereologie, 121(2), 106-109. https://hdl.handle.net/2078.5/146126 (Original work published 1994)