[Two cases of retroperitoneal liposarcoma arisen from perirenal fat tissue, which could not be diagnosed preoperatively].

We report two cases of retroperitoneal liposarcoma arisen from the perirenal fat tissue, which could not be diagnosed preoperatively. Case 1 is a 58-year-old male. He complained of left flank tumor.

[Spontaneous rupture of the ureter caused by metastatic ureteric tumor: a case report].

A 66-year-old man was admitted to our hospital with left flank pain. Drip infusion pyelography (DIP) and abdominal computed tomography (CT) showed urinary extravasation. Magnetic resonance imaging (MRI) and retrograde pyelography (RP) demonstrated stenosis of the ureter.

[Bellini duct carcinoma of the kidney: a case report].

A case of Bellini duct carcinoma is reported. A 70-year-old man visited our hospital because of gross hematuria and left flank pain. Although no abnormality was found on ultrasonography, drip infusion pyecography, computed tomographic scan and cystoscopy.