A 37-year-old woman presented with an incidentally found retroperitoneal fat-containing tumor which was 9 cm long. Tumor morphology: The tumor surrounded the right kidney and was composed of homogenous adipose tissue. The contrast-enhanced computed tomography (CT) and magnetic resonance imaging (MRI) revealed that the tumor consisted of adipose tissue and thickened septum-like structures and spotty non-adipose structures. The tumor had thin blood vessels, irregular septa, and spotty small soft-tissue nodules.
The tumor did not demonstrate an angiomyolipoma-like lesion or a beak sign in the kidneys (for further inferences, please refer to the cover image). What could be the probable diagnosis for this patient? Atypical lipomatous tumor Myxoid liposarcoma Extrarenal angiomyolipoma Renal angiomyolipoma mimicking a well-differentiated retroperitoneal liposarcoma Source: Case Reports in…
