结论鳞样小汗腺导管癌是一种非常罕见的低度恶性肿瘤，局部切除后可复发，未见转移报道。
Conclusions Squamoid eccrine ductal carcinoma is an exceedingly rare low-grade malignant tumor and can recur after excision but do not metastasize.
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。
Background and Objective: The treatment and prognosis of extrapulmonary small cell carcinoma (EPSCC), a uncommon malignant tumor, have seldom been reported.
食管癌肉瘤是肉瘤与癌两种成份共存的一种特殊类型并且十分少见的恶性肿瘤。
Carcinosarcoma of the esophagus is a rare malignant tumor composed of both carcinomatous and sarcomatous elements.
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