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  • Title: Schwannoma with sweat duct differentiation.
    Author: Elston DM, Bergfeld WF, Biscotti CV, McMahon JT.
    Journal: J Cutan Pathol; 1993 Jun; 20(3):254-8. PubMed ID: 7690051.
    Abstract:
    We report a schwannoma with well differentiated ducts resembling cutaneous sweat ducts. The tumor presented as a painless mass near the left knee of a 41-year-old female. The mass had been present for many years. Some increase in size had been noticed over the previous 2 to 3 yr. The bulk of the tumor was composed of spindle cells with the appearance of Antoni A and Antoni B tissue. Rare mitotic figures were noted. In several areas of the tumor, numerous well-differentiated ducts were present. Most resembled normal cutaneous sweat ducts. In some areas, cystic dilatation of the ducts was present. Focal areas demonstrated poorly formed ducts and single cells with prominent nuclei and ample cytoplasm. Well formed ducts, poorly formed ducts, and single cells marked with AE 1/3 (keratin) and epithelial membrane antigen. The spindle cell proliferation marked for S 100 protein and vimentin. Sweat duct differentiation has not been reported previously in either benign or malignant schwannoma. Light and electron microscopic features of this tumor are presented.
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