MALIGNANT OSTEOCLAST-LIKE GIANT-CELL TUMOR OF THE KIDNEY

Osteoclast-like giant cell tumors are rare mesenchymal tumors that typ ically present in osseous tissue and are remarkable because of their s low growth. We report the sixth documented case of a malignant osteocl astlike giant-cell tumor primary to the kidney of an 81-year-old man w ith a 5-month history of hematuria. Postnephrectomy analysis of the tu mor, including immunohistochemical stains and electron microscopy, con firmed the diagnosis. Although the patient died of unrelated complicat ions, metastatic disease was suspected. (C) 1998, Elsevier Science Inc . All rights reserved.