@Article{,
AUTHOR = {Kevin J. Flynn, Hristos Z. Kaimakliotis, Liang Cheng, Chandru P. Sundaram},
TITLE = {Primary renal extra-osseous osteosarcoma},
JOURNAL = {Canadian Journal of Urology},
VOLUME = {22},
YEAR = {2015},
NUMBER = {4},
PAGES = {7929--7931},
URL = {http://www.techscience.com/CJU/v22n4/61244},
ISSN = {1488-5581},
ABSTRACT = {Primary renal extra-osseous osteosarcoma is an 
exceedingly rare and deadly kidney neoplasm with only 
27 reported cases to date. Extra-osseous osteosarcoma is 
a mesenchymal sarcoma that produces osteoid, but has 
no skeletal or periosteal involvement and most commonly 
arises in the lower extremities. Yet, it can arise in other 
locations such as the kidney. Extra-osseous osteosarcoma 
behaves as a separate entity from osseous osteosarcoma 
and should be treated as such. The treatment is surgical 
resection. Five year overall survival is 46% for local and 
10% for metastatic disease. Additionally, 45%-50% of 
patients experience disease recurrence. We present a 
77-year-old woman who underwent work up for recurrent 
gross hematuria and subsequently underwent radical 
nephroureterectomy for presumed upper tract urothelial 
cell carcinoma. However, pathologic analysis revealed a 
diagnosis of primary renal extra-osseous osteosarcoma. 
She is alive with no evidence of disease 30 months after 
surgery.},
DOI = {}
}