TY - JOUR T1 - Longitudinal melanonychia on multiple nails induced by hydroxyurea JF - BMJ Case Reports DO - 10.1136/bcr-2016-218644 VL - 2017 SP - bcr2016218644 AU - Anh Ly Nguyen AU - John E Körver AU - Chantal C W Theunissen Y1 - 2017/02/15 UR - http://casereports.bmj.com/content/2017/bcr-2016-218644.abstract N2 - A Caucasian woman aged 67 years presented to our outpatient clinic with an 18 months history of asymptomatic continuously progressing longitudinal brown bands on her toenails. There was no history of trauma or friction to her toenails. She was ineffectively treated with oral terbinafine for 3 months due to suspected onychomycosis. Since 3 years, she received treatment for polycythaemia vera with hydroxyurea in varying doses ranging from 500 to 1500 mg daily. Her polycythaemia vera was adequately regulated. She experienced no other side effects. Her medical history was otherwise unremarkable. Family history was negative for longitudinal melanonychia and melanoma.Physical examination showed multiple longitudinal brown-pigmented bands on eight toenails with subungual hyperkeratosis. Pseudo-Hutchinson's sign was present as the pigmentations extended proximally beneath the translucent cuticles, but the cuticles and nail folds were not affected (figures 1 and 2A). Her fingernails … ER -