[Leg ulcer in a patient treated with hydroxyurea for polycythemia vera].

Introduction: Causes of leg ulcers vary widely, although venous insufficiency and peripheral arteriopathy are most common. Ulcers are much rarer in patients treated by hydroxyurea.
Case: A 66-year-old woman who had been treated with hydroxyurea for polycythemia vera for four years came to our consultation a month after ulceration of the left lateral malleolus had begun. Symmetric peripheral pulses were present and there was no patent venous insufficiency. After two months of local symptomatic treatment, the size of the ulcer had increased. The possible involvement of hydroxyurea in the genesis and maintenance of this leg ulcer was then considered. Hydroxyurea was stopped, and the ulcer progressively grew smaller, finally healing completely two months later.
Discussion: We conclude that hydroxyurea was the primary cause of the malleolar ulcer, for it healed rapidly when this treatment stopped. Hydroxyurea causes cutaneous atrophy; when followed by microtrauma, associated with deterioration in DNA repair mechanisms, it may lead to the formation of persistent cutaneous ulcers. Hydroxyurea can also affect the microcirculation and induce tissular anoxia, which may also explain both the occurrence of cutaneous ulcers after microtrauma and their often painful character.