Hydroxyurea is a cytotoxic agent that is being increasingly used for a
number of malignant and nonmalignant systemic diseases. This agent is
particularly well tolerated, with dose-related myelosuppression being
the primary side effect. We describe a patient who had patchy interst
itial infiltrates with cavitation 2 months after the start of therapy
with hydroxyurea. After hydroxyurea therapy was discontinued and empir
ic corticosteroid therapy was given, the pulmonary infiltrates resolve
d. This is a case of presumed hydroxyurea-induced lung disease, the fi
rst with supportive lung biopsy material. It is essential for physicia
ns to be aware of this potentially life-threatening toxicity.