Abstract
A 68–year–old woman seen for an abdominal mass was found to have a huge, 8×6 cm elastic hard lobular mass palpable in the left abdomen. Abdominal ultrasonography, computed tomography (CT), and magnetic resonance imaging (MRI) confirmed a retroperitoneal mass adhering to the left kidney, causing hydronephrosis. The resected tumor was elastic, hard, and yellowish–white. Pathologically, it consisted of well–differentiated liposarcoma with lipoblasts and a lipoma–like pattern and malignant fibrous histiocytoma (MFH) with atypical spindle cell hyperplasia without lipogenesis. The histological diagnosis was dedifferentiated liposarcoma.
