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Abstract

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Well differentiated thymic carcinoma(WDTC) was recently separated from cortical
thymoma. It is characterized by a predominance of epithelial cells with usually low
mitotic rate, an epidermoid differentiation with slight to moderate cytologic atypia and
lobular growth patters. In recent reports, an uncommon spindle cell variant of WDTC,
which is composed of spindle shaped epithelial cells, has been discribed. We investigated
an unusual case of WDTC consisted of purely spindle shaped epithelial cells in a
66-year-old female. Radiologically, the well demarcated mass was located in the anterior
mediastinum with focal invasion into the surrounding left upper lung. The tumor, 10¡¿8
¡¿5 §¯, was encapsulated with thin fibrous tissue and showed a pale yellow solid and
lobulated cut surface. Microscopically, it consisted of solid sheets of purely spindle
shaped epithelial cells with mild atypism, a low mitotic rate and focal epidermoid
differentiation. (Korean J Pathol 1995; 29: 800¡­803)

Å°¿öµå

Well differentiatied thymic carcinoma; Spindle cell variant;

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