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Dermpath-India

Tumours of the Hair Follicle

Dr Sampurna Roy MD     

 

                                                                                                                      

 

 

There is no universally accepted classification of hair follicle tumours. 

[ Further reading:

Hair follicle tumors of the skin.  

Hair follicle tumors of skin.

A review and proposed new classification of benign acquired neoplasms with hair follicle differentiation.   ]

It is often possible to identify the predominant type of follicular differentiation:

Example- Outer root sheath, hair germ, infundibular etc.

The tumours can be classifed depending on which part of the hair follicle the lesion differentiates toward or most closely resembles.

Hair Follicle Differentiation:

             


Hair follicle infundibulum-  Keratinous cystic structures

Outer root sheath- Clear cells, peripheral palisading and hyaline basement  membrane.

Follicular germ with mesenchyme- Papillary mesenchymal bodies

Follicular bulb-
Cells of hair matrix included.

 

Classification:

Hair Germ Differentiation:

Trichoepithelioma

Desmoplastic Trichoepithelioma

 

Trichofolliculoma

 

Trichoblastoma

 

Cutaneous lymphadenoma (variant of trichoblastoma)

 


Basaloid Follicular Hamartoma               
 

Infundibular differentiation:

Trichoadenoma

Dilated Pore of Winer

Pilar Sheath Acanthoma

 

Tumour of Follicular Infundibulum

 

Outer root sheath differentiation:
                    
Trichilemmoma

Desmoplastic Trichilemmoma

Trichilemmal Carcinoma

 

Proliferating Trichilemmal Cyst (Pilar Tumour)

 

Matrical differentiation:
                  
Pilomatrixoma

Pilomatrix Carcinoma

 

 

 

Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)

 


 

 

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