Hemangioendothelioma of bone.Unusual tumor characterized by indolent course

ASCIJIAK tumors, primary in bone, are in-V cluded in the group of the rarest iieoplnsins ol bone.There is no unilormly accepted classification of vascular tiirnors.5,~. 1 1 T e n cases of a relatively pure and readily recognisable histologicdl pattern were asscmbled from our own arid consultation sourccs ;I nd :IY c the basis ol' this report.Microscopic slides are available in all of these cases, either from biopsy or amputation specimens, arid all l'ulfill thc criteria elaboratccl by Stoutlo that delineate these tumors as hemangioendotheliomas.Some ol the hlcmorial Hospital and Jamcs Ewing Hospital cases have been previously reporietl as angiosarcomas ol bone.4 'I'he ~~ertiilcnt clinical d a t a are surrirnarizetl Front I lie Department of Pathology, Memorial Hospital for Canter and Allied Diseases, and the James F w n g HospiLal, 444 E. 68th St., New York 21, N.Y.