Stereotypical Example of a Proliferating Tricholemmal Cystic Acanthoma


View Figure  
View Figure  
View Figure  		Fig. 1A–C  Proliferating tricholemmal cystic acanthoma. The silhouette of this cystic neoplasm and the cytopathologic features of it indicate benignancy. It is a benign neoplasm that have features in common with what is termed, conventionally, tricholemmal cyst and by us isthmic-catagen cyst. The nuclei are not crowded, not pleomorphic, and not in mitosis, unlike the situation in proliferating tricholemmal cystic carcinoma. Another major difference between the acanthoma and the carcinoma is absence of striking protuberances of neoplastic epithelial cells from the lining into the central cornified component. In short, this neoplasm is a benign counterpart of proliferating tricholemmal cystic carcinoma.