Mediastinal liposarcomas (LPS) are rare tumours. We report a case of primary myxoid LPS in a 22-year-old woman suffering from cough, dyspnoea on exercise and asthenia for 3 weeks. Thoracic MRI showed a large tumour on the right side. After neoadjuvant chemotherapy, a complete resection was performed, followed by adjuvant thoracic irradiation. Eighteen months after the diagnosis, no sign of recurrence was detected. Mediastinal LPS include a heterogeneous group of bulky tumours, the progression of which depends on the histological type. The prognosis is dominated by the operability of the tumour. Adjuvant therapies are not established.
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