Purpose To study pathomorphological and immunohistochemical characteristics of small cell malignant tumor(SCMT) of bone.
目的研究骨小细胞恶性肿瘤（SCMT）的病理形态和免疫组化特点。
Background and Objective: The treatment and prognosis of extrapulmonary small cell carcinoma (EPSCC), a uncommon malignant tumor, have seldom been reported.
背景与目的：肺外小细胞癌是一种少见的恶性肿瘤，有关其治疗及预后的文献报道不多。
Of the 25 patients there were 18 mature teratomas, 6 immature teratomas, and 1 malignant small round cell tumor.
成熟型畸胎瘤18例，未成熟型畸胎瘤6例，恶性小圆细胞性肿瘤1例。
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