This clinicopathologic study concerns 8 cases of extraskeletal @entity2828 , including electron-microscopic examination of one case. In three @entity1 , autopsy was done. The age of the @entity1 ranged from 12 to 31 years with a median of 16 years. The @entity5 mainly arose in the soft tissues of the trunk (4 cases) and the lower extremity (3 cases). Histologically, they were made up of closely packed uniform, small cells, arranged in sheets separated by strands of fibrovascular stroma. The @entity5 cells had round to oval nuclei with finely dispersed @entity221 almost invariably containing a fair amount of diastase-digested PAS-positive material. Ultrastructurally, the @entity5 cells were composed principally of undifferentiated mesenchymal cells, and contained prominent pools of glycogen in the cytoplasm. Aggregates of intermediate filaments were seen in a perinuclear location. These light- and electron-microscopic findings are indistinguishable from those of @entity2828 of the bone. Differential points from other soft-tissue small round cell sarcomas such as @entity5 ( @entity1897 ), embryonal or @entity3943 were briefly discussed.

Extraskeletal XXXX . A clinicopathologic and electron microscopic. Analysis of 8 cases.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity2828 :: ('MESH:D012512', 'Disease') :: ["Ewing's sarcoma"] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'malignant neuroepithelioma', 'tumors'] @entity1897 :: ('MESH:D010523', 'Disease') :: ['peripheral neuroblastoma'] @entity3943 :: ('MESH:D018232', 'Disease') :: ['alveolar rhabdomyosarcoma'] @entity221 :: ('MESH:D005334', 'Disease') :: ['chromatin and scanty ill-defined cytoplasm']
@entity2828 :: (MESH:D012512,Disease) :: ['Ewing's sarcoma']
