1993 Ackerman AB, deViragh P, and Chongchitnant N

 
Neoplasms with Follicular Differentiation. Philadelphia: Lea & Febiger, 1993 (Fig. 17).

View Figure  		Fig. 17  (orig. Fig. 14–6 (A–C)). Mantle-oma at an early stage (Fibrofolliculoma). At scanning magnification, individual vellus follicles can be seen to be the center of fibroepithelial changes that are demarcated by clefts. The epithelial component consists of mantle-like cords of epithelial cells arranged in imperfect fenestrations; the fibrous component is constituted of ribbons of collagen bundles aligned parallel to one another and perpendicular to cords of epithelial cells. The stroma is richly fibrocytic and highly vascular. Although most of the epithelial cells within cords and columns of this fibrofolliculoma are undifferentiated, many show signs of sebaceous differentiation in the form of mature sebocytes disposed as solitary units and lobules, and sebaceous ductal structures. Fibrofolliculoma, therefore, is an abnormality of mantle-like structures and their stroma, and represents a stage in the evolution of trichodiscoma.
 

Message

 
Fibrofolliculoma is a mantleoma, a hamartoma that consists initially of undifferentiated mantle epithelium arranged in fenestrated pattern; in time, that epithelium differentiates into sebocytes, sebaceous lobules, and sebaceous ducts. The end-stage of the same process, i.e., when stroma predominates over encircling mitt-like sebaceous glands, is designated trichodiscoma.
 
Fibrofolliculoma and trichodiscoma are different stages of the same hamartomatous condition. One name for it suffices.
 

Critique

 
In theory, trichodiscoma could represent an early stage of the hamartoma and fibrofolliculoma a late one.