Cystic retroperitoneal dedifferentiated liposarcoma: A case report

Figure 1:. An 86-year-old male with cystic retroperitoneal dedifferentiated liposarcoma who presented with unexplained weight loss and frequent falls. Axial (a), Coronal (b), and Sagittal (c) contrast enhanced computed tomography (CT) images of the abdomen and pelvis in the portal phase demonstrate a large heterogenous complex cystic lesion in the left retroperitoneum (arrows). Differential considerations on CT included a complex hematoma, abscess, or a cystic tumor.

Figure 2:. An 86-year-old male with cystic retroperitoneal dedifferentiated liposarcoma who presented with unexplained weight loss and frequent falls. Axial T2 (a), Axial T1 (b), Coronal T2 (c), and Coronal fatsaturated T1 (d) Images demonstrate heterogeneous mixed T2 signal intensity with foci of T2 high signal intensity throughout the lesion consistent with cystic components (white arrows). Multiple areas of T1 high signal suggesting hemorrhage of different ages (red arrows).

Figure 3:. An 86-year-old male with cystic retroperitoneal dedifferentiated liposarcoma who presented with unexplained weight loss and frequent falls. T1 in-phase (a) and T1 out-of-phase (b) images as well as diffusion-weighted imaging (c) and apparent diffusion coefficient map (d) demonstrate foci of microscopic fat in the superior portion of the retroperitoneal mixed cystic mass (white arrow), and restricted diffusion in the periphery of the retroperitoneal heterogenous mixed cystic mass (red arrows).

Figure 4:. An 86-year-old male with cystic retroperitoneal dedifferentiated liposarcoma who presented with unexplained weight loss and frequent falls. Post contrast axial fat saturated T1 (a) and subtraction (b) as well as post contrast coronal fat saturated T1 (c) and subtraction (d) images demonstrate enhancement of the thick irregular peripheral walls of the mass and its thick internal septations (white arrows). No enhancement of the predominantly central cystic components (asterisk).