目的：探讨青少年肾混合性上皮间质肿瘤( mixed epithelial and stromal tumor of the kidney, MESTK)的临床病理学特征,提高对此罕见疾病的认识。方法对1例MESTK(17岁)的临床病理学特征及免疫表型,并复习相关文献,综合分析青少年MESTK的临床及病理特征。结果患者女性,17岁,临床表现为先天性会阴部液体外溢。镜下见肿瘤呈结节状生长,肿瘤由上皮和间质两种成分构成,腺上皮细胞呈柱状或纤毛柱状；腺体周围间质细胞丰富似卵巢样,远离腺体的梭性细胞呈束状平滑肌样分化。免疫表型：上皮细胞CK7、vimentin阳性,间质细胞SMA、vimentin、ER、PR均阳性,远离腺体的间质细胞desmin阳性。结论 MESTK是一种罕见的肾脏良性肿瘤,多见于围绝经期女性,亦可发生于青少年,且与激素使用史无关,需与发生于青少年具有双向分化的肾肿瘤相鉴别。%Purpose To investigate the clinicopathological features of adolescent mixed epithelial and stromal tumor of the kidney ( MESTK) and improve recognization of this rare disease. Methods Clinicopathological and immunohistochemical characteristics of MESTK occured in 17-year-old girl were studied. Reviewed the related literatures, clinical and pathological characteristics of adoles-cent MESTK were analysed comprehensively. Results Congenital perineal spill was the main clinical manifestations. Microscopically, the tumor showed nodules and was composed of a mixture of epithelial and stromal elements. Glands were lined with columnar or cilia-ted columnar cells. Stromal cells surrounding glands seemed like ovaries and away from glands seemed like the differentiation of smooth muscle. Immunohistochemical staining revealed that the epithelial cells were positive for CK7 and vimentin. Stromal cells expressed desmin, smooth muscle actin ( SMA) , ER and PR. It was noteworthy that stromal cells away from glands expressed desmin. Conclu-sions As a kind of rare benign neoplasm of kidney, MESTK often occurs in perimenopausal women. But MESTK can also occur in ad-olescence, and has nothing to do with the use of hormone. Therefore, the renal tumor occurred in teenagers with biphasic differentiation should be differentiated from MESTK.
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