Multiple variably sized round to irregular islands or nests of epithelial cells ;

Tumour lobules consist of an outer rim of palisading basaloid cells surrounding a central zone of large cells with clear cytoplasm and large vesicular cells ;

Dense infiltrate of small, mature lymphocytes within the islands ;

Tumour lobules embedded in a loose-to-dense fibrous stroma ;  

Few scattered lymphocytes in the stroma ;

Focal follicular differentiation and sometimes sebaceous differentiation;

Focal mucinosis, osteoma formation or prominent sweat gland duct component in some cases ;

Central keratinization in some lobules.

Immunohistochemistry: 

Clear epithelial cells in the lobules and the basaloid peripheral cells: Cytokeratin positive.

Lymphoid component reacted with common leukocyte antigen (CLA) and  T-cell markers (UCHL-1, CD3).  

Some CD30+ large clear cells may be present. 

Many large epithelial cells in the lobules and some dendritic cells in the stroma : S-100 positive.