Primary telangiectatic osteosarcoma of a non-functioning kidney. A case report
2015
Abstract Pure renal sarcomas are rare; sometimes they are related to the renal capsule or blood vessels and a few cases of osteosarcoma have been reported. We report an unusual case of renal osteosarcoma in an 80-year-old man who underwent nephrectomy for pyelo-ureteral stenosis and hydronephrosis. The tumor was hemorrhagic and attached to the pyelocaliceal surface. Histopathology revealed a pleomorphic neoplasm with features of telangiectatic osteosarcoma. No areas of transitional or renal cell carcinoma or other sarcomatous component were present. Relevant features, such as calcifications and osseous metaplasia, were present at the implantation zone of the tumor. The present case differs from previously reported ones as it was an unexpected finding observed in a non-functioning kidney with good clinical behavior and corresponded to an unusual morphologic variant of osteosarcoma, the telangiectatic type. Finally, the relation with areas of calcification and ossification poses interesting questions as to its histogenenis.
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