Rhabdomyosarcoma is a malignant tumour generally observed in children or adolescents; thoracic localization is rare. The authors report a case of embryonary rhabdomyosarcoma of the thoracic wall in a 36-year-old subject. Pathology examination of surgical specimens confirmed the diagnosis. Treatment included surgical exeresis together with pre- and post-operative chemotherapy combining doxorubicine (40 mg/m2/cycle), ifosfamide (6 g/m2/cycle) and dacarbazine (900 mg/m2/cycle). Local recurrence, requiring radiotherapy, was observed a few months later and led to the patient's death after a 9-month clinical course.