Pleomorphic liposarcoma (PLS), the rarest subtype of liposarcoma (LS; see this term), is an aggressive, fast growing tumor located usually in the deep soft tissues of the lower and upper extremities. It is characterized by a variable number of pleomorphic lipoblasts and, in contrast to dedifferentiated liposarcoma, it lacks any association with well-differentiated liposarcoma (see these terms). [from
ORDO]