Angiosarcoma of the urinary bladder is an extremely rare and poorly characterized tumor. We are presenting the 13th reported patient who was an 89-year-old man initially presented with massive hematuria. His past medical history included external-beam radiation for prostate cancer 12 years ago. His PSA was 0.26 ng/dL. His CT-Urography demonstrated a highly vascular mass originating from the bladder base. The mass was partially resected, transurethrally. The pathology was consistent with primary angiosarcoma of the urinary bladder. Bone scan and CT-U showed metastasis to spine. The patient was treated with palliative radiotherapy for back pain due to metastasis, and he refused chemotherapy. The patient died 3 months after his initial diagnosis.

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Introduction: A relatively high proportion of patients who undergo partial or radical nephrectomy for enhancing renal mass actually have oncocytoma, a benign renal tumor. Several parameters have been shown to be typical for oncocytoma, but only a small number of patients present with these parameters. The aim of our study was to report the clinical, operative and postoperative characteristics of patients who underwent nephron-sparing surgery in our center with a histopathological diagnosis of oncocytoma compared to patients with malignant renal tumor. Patients and Methods: Sixty-three out of 530 patients who underwent nephron-sparing surgery for enhancing renal mass were diagnosed with oncocytoma. Clinical and radiological features and operational data of these patients were compared with patients who had malignant renal tumors. Results: Mean age of patients with histologically proven non-malignant oncocytoma was significantly higher than that in patients with malignant renal cell carcinoma (66.7 vs. 61.4 years). All other analyzed variables showed no significant difference between the 2 groups. Conclusions: No reliable clinical, operative or radiological parameters can differentiate preoperatively between oncocytoma and malignant renal neoplasms.

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