A case of solid-cystic hidradenoma occurring on the left axilla of an 11-year-old girl is reported. The tumor was hemispherical, covered with nomal skin, and movable to the underlying tissue. Histopathologically the tumor was revealed to be localized in subcutaneous fat tissue and surrounded with thin fibrous connective tissue. The tumor cells consisted of epidermoid cells and clear cells, although the former were dominant. Many tubular structures containing colloidal substance were observed within the tumor
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