[Hereditary multiple exostosis complicated by spontaneous haemothorax].

Spontaneous haemothorax is a rare event in the general population. However some diseases, including hereditary multiple exostosis, have an increased incidence of this complication. We report the case of a 22 year old patient with hereditary multiple exostosis who presented with a right sided haemothorax due to an exostosis of the seventh rib. The pathophysiology of spontaneous haemothorax in the setting of hereditary multiple exostosis is discussed together with surgical treatment and long term follow up.