The increased use of surgery as a treatment or as an alternative for improvement means that we have a larger number of patients in the operating theatre, including those who suffer from rare diseases. Poland Syndrome is a rare congenital disease associated with muscle development. These patients may have a broad spectrum of abnormalities, which include thoracic anomalies, which can alter the ventilatory management at the level of the airway; the possible onset of malignant hyperthermia. This leads the anaesthetist to take certain preventive measures. We report the case of a patient with Poland syndrome operated for the placement of a breast prosthesis. We avoid halogenated agents, and use a Total Intravenous Anaesthesia with propofol. The appearance of muscle spasms as a result of the use of propofol, forced us into a second anaesthesia to perform total intravenous anaesthesia with Midazolam.