[Liposarcomas of the mediastinum in atypical locations: report of two cases].

Liposarcomas of the mediastinum are unusual tumors characterized by compression of neighboring structures and frequent recurrence. Computed tomography and magnetic resonance imaging provide useful data for diagnosis. According to a review of the literature, surgical resection is the most effective treatment. We report two cases of mediastinal liposarcoma: the first was a liposarcoma that was a recurrence of an atypical lipoma of the neck, and the second was a giant mediastinal liposarcoma involving both hemithoraces.