RT Journal Article SR Electronic T1 Intradural Primary Chondroblastic Osteosarcoma: Case Report JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1960 OP 1962 VO 22 IS 10 A1 Walker, Matthew T. A1 Toye, Leon R. A1 Coons, Stephen W. A1 Porter, Randall W. A1 Wallace, Robert C. YR 2001 UL http://www.ajnr.org/content/22/10/1960.abstract AB Summary: We report a rare case of intradural primary osteosarcoma (IPOS) in a 74-year-old man with aphasia and right-sided hemiparesis. Radiologic workup revealed a large, partially calcified, left-sided frontotemporal intracranial mass lesion. At surgery, the tumor was found to be entirely intradural; it involved the brain and subarachnoid space of the left sylvian fissure. The adjacent dura was uninvolved. Neuropathologic findings confirmed the diagnosis of chondroblastic osteosarcoma. To our knowledge, this is the sixth reported case of IPOS and the first reported case of the chondroblastic subtype.