Liposarcoma originating in left kidney: A rare case report
The present case has been reported in the journal Urology Case Reports.

Incidental renal mass affects half of people older than 50 years. The mass is detected by image when evaluating non-renal complaints. Liposarcoma is one of the common soft tissue sarcoma (STS) in adults and the most common lesion is observed in the retroperitoneum. In this case, the liposarcoma originates from the left kidney, not from the retroperitoneum.

A 67-year-old man had a history of hypertension for 20 years. The patient experienced intermittent fever for 1 month, but no obvious source was found. The laboratory data were within normal range, including normal urine analysis. Initially, abdominal ultrasonography was arranged to evaluate the possible source.

A heterogeneously, hypoechoic mass about 92 mm in diameter was revealed over the left kidney (Fig. 1A). Subsequently, computed tomography (CT) (Fig. 1B) of the abdomen was performed; a hypointense mass without downward displacement of the left kidney was observed. Hence, a tumor was considered from the kidney parenchyma because it was analogous to an atypical enhanced renal tumor in the arterial phase of CT, not from retroperitoneum.

Further management, such as magnetic resonance imaging (MRI) (Fig. 1C) of the kidney, was arranged to evaluate in details. A 1.5 T superconducting magnet and phase-arrayed body coil were used. The tumor was huge (size: 10.3 cm × 9.3 cm × 8 cm) (Fig. 1D) and had an ambiguous border over the upper pole of the kidney. It extended into the perinephric tissues but not into the ipsilateral adrenal gland. Trans-arterial embolization (TAE) of the tumor (Fig. 2A) was planned to prophylactically reduce blood loss before surgery.

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