Recurrent retroperitoneal dedifferentiated liposarcoma

Liposarcomas (LPS) are malignant tumors deriving from the adipocytic differentiation process. They are divided into four subtypes of LPS – well-dif ferentiated (WDLPS), dedifferentiated (DDLPS), myxoid (MLPS), and pleomorphic (PLPS). Regarding histological subtype and molecular pathology, tumors have different recurrence rates, radiosensitivity, and chemosensitivity, representing a challenge to every physician involved in their treatment decision. DDLPS commonly appears as a focal outgrowth of a WDLPS lesion