Multiple well-differentiated retroperitoneal liposarcomas with different patterns of appearance on computed tomography: A case report

Figure 1 Ultrasound examination showing multiple solid masses with unclear boundaries, irregular shapes, and nonuniform internal echoes.

Figure 2 Abdominal-pelvic computed tomography showing two masses. The left one exhibited a fat-like density with a -65 HU value, a clear boundary, and a convoluted vascular course, and contrast-enhanced scanning did not show significant enhancement; the right one had a mixed density, and contrast-enhanced scanning yielded the following computed tomography values during the three phases: 28/31/50 HU.

Figure 3 Surgically removed specimens measuring 35 cm × 22 cm × 20 cm with a lobulated shape (left) and measuring 25 cm × 18 cm × 17 cm with a regular shape (right).

Figure 4 A lipoma-like lesion characterized by a leaf-like pattern aggregate of mature adipocytes separated by fibrous septa. This was classified as atypical lipomatous tumor/well-differentiated liposarcoma (hematoxylin and eosin staining: × 100 and × 400).