胸膜类似与囊性胸腺瘤的囊性滑膜肉瘤1例

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47岁，男性，CT示前纵隔病变，最大径约10 cm ；大体标本易破裂，内容物流失。

病例来自
Cystic synovial sarcoma of the pleura mimicking a cystic thymoma: a case report illustrating the role of decreased INI-1 expression in differential diagnosis

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HE：肿瘤细胞呈实性附于胸膜；肿瘤与肺组织界限清楚；
囊壁表层光滑；实性区肿瘤细胞呈梭形；核轻度深染，核仁不明显；核中度非典型性，细胞丰富，可见核分裂像。

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免疫组化CK7、EMA、INI1、Ki-67

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最后一图为SYT重排（Fluorescence in situ hybridization using SYT break-apart probe. One probe labeled in SpectrumOrange lies distal to the SS18 gene. The other probe labeled in SpectrumGreen lies proximal to the SS18 gene. One fusion signal shown in yellow color was present in these two nuclei. One orange and one green signal were also observed, indicating rearrangement of SYT gene (× 1000).）

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