Distinct histological features characterize primary XXXX .

@entity1 @entity2194 @entity75 @entity5 @entity5426 @entity189 @entity2279 @entity2280 @entity2880
AIMS: To define the histological criteria of primary @entity5426 . METHODS AND RESULTS: Forty-two @entity5426 of bone in 23 males and 15 females were studied. Histological criteria were related to @entity1 ' outcome. Eleven @entity1 had @entity75 . Lesions were located in the long and short tubular bones followed by the pelvis, spine and trunk. @entity5 cells were positive for @entity2279 in 38 of 40, @entity2880 Factor in 21 of 35, @entity2280 in 15 of 38, smooth muscle actin in 22 of 36, D2-40 in 11 of 35 and keratin AE1AE3 in 27 of 39. Thirty-nine @entity5 showed an epithelioid phenotype. One- and 5-year survival rates were 55% and 33%, respectively. Survival analysis showed that a macronucleolus, three or more mitoses per 10 @entity2194 ( @entity2194 ) and fewer than five eosinophilic granulocytes per 10 @entity2194 within a @entity5 was associated with an even worse survival compared to the overall group. CONCLUSIONS: Because keratin positivity is seen in the majority of cases, pathologists should avoid misinterpretation as @entity189 . A macronucleolus, three or more mitoses per 10 @entity2194 and fewer than five eosinophilic granulocytes per 10 @entity2194 can be used to further define @entity5426 .
