Low-grade fibrosarcoma with palisaded granulomalike bodies (giant rosettes) - Report of a case that metastasized

"Hyalinizing spindle cell tumor with giant rosettes" is a tumor recently de scribed by Lane et al. and thought by them possibly to represent a form of low-grade fibromyxoid sarcoma. Proof of a metastatic potential was lacking. We report an example of this tumor on the arm of a 28-year-old woman. The ultrastructural study of the tumor confirmed the fibroblastic nature of the lesion, which subsequently metastasized to the lung. Histologically, the g iant rosettes simulated palisaded granulomas. Our findings warrant classify ing the tumor as a sarcoma, and we suggest the designation low-grade fibros arcoma with palisaded granulomalike bodies (giant rosettes).