[Urinary tract hemangiopericytoma treated with radical surgery and neoadjuvant chemotherapy. Report of two cases.]
OBJECTIVE
Hemangiopericytoma is a tumor of vascular origin. It is very rare in the prostate. They are generally aggressive tumors. Currently, the treatment of choice is radical surgery. In the literature, there are less than 50 cases described, and neoadjuvant treatment has not been reported in any article. This treatment presents positive responses in another type of sarcomas. Our goal is to report two cases of malignant hemangiopericytoma. The first case was treated with radical surgery and the second case was treated with neoadjuvant chemotherapy before surgery.


METHODS
The first case is a 40 year old male. Obstructive urinary symptoms were his first symptoms. A prostate mass with tumor characteristics was seen on ultrasound. After transrectal biopsy, he was diagnosed with hemangiopericitoma. Because the tumor size, neoadjuvant chemotherapeutic prior to radical surgery was decided. The second case is a 77 year old male with an incidental diagnosis of renal mass. After radical nephrectomy, he was diagnosed with hemangiopericitoma. He did not receive adjuvant chemotherapy.


RESULTS
In the first case, after neoadjuvant therapy, tumor size was reduced significantly. A pelvic exenteration with radical cystoprostatectomy and rectal resection and Bricker type urinary diversion and colostomy were carried out. In the second case controls after radical nephrectomy were correct and he did not need any treatment.


CONCLUSIONS
In urinary tumors, the prostate hemangiopericytoma is a rare entity. Currently, neoadjuvant chemotherapy is not established as treatment for these tumors. For other sarcomas neoadyuvant treatment has good response. In our case, a good result was obtained with neoadjuvant chemotheraphy before surgery. However, a greater number of cases are necessary to establish the use of neoadjuvant chemotherapy in urinary hemangiopericytomas.