Choc anaphylactique peropératoire au bleu patenté

Patent blue and isosulfan blue dyes are currently used during sentinel lymph node biopsy. They can cause allergic reactions that can be relatively severe. Here we report the case of a patient who experienced a grade IV anaphylactic reaction, with tracheal obstruction that required three interventions. Skin tests done later confirmed allergy to patent blue dye; the tests induced a small syndrome reaction. Surgical personnel who use patent blue dye should be made aware of the risk of allergic reactions, sometimes severe, to this dye.