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pilomatricoma

synonymes: calcifying epithelioma of Malherbe, trichomatrixoma, pilomatricoma

 

Variants

-  pilomatrixoma with only germinative-matrical cells (see photos) ((with the passage of time, the number of basaloid cells decreases progressively, eventually to be replaced by ghost cells)
-  lymphangiectatic variant of pilomatricoma (#15324397#)
-  pilomatricoma with a bullous appearance (#15268712#)

Differential diagnosis

-  basal cell carcinoma
-  pilomatrical carcinoma

Etiology

-  some cases of pilomatrixoma are caused by mutation in the beta-catenin gene (CTNNB1) (MIM.116806) (#12575848#, #11472567#, #11004631#, #10192393#)

Epidemiological forms

-  multiple pilomatricomas (pilomatricomatosis or pilomatrixomata) (#8747580#, #12702091#)
-  familial pilomatricomas (#14984583#, #12702091#)

Associations

-  multiple pilomatricomas and myotonic dystrophy (#10434894#, #3175462#, #11978577#, #8891827#)
-  multiple pilomatricomas and trisomy 9 (#11834859#)
-  peripheral schannoma (#15640970#)
-  multiple pilomatricomas in Rubinstein-Taybi syndrome (#15324407#, #8170843#)
-  Turner syndrome (#10640845#)


Pilomatrixoma. Section. Macroscopy

Pilomatrixoma. Slide. HE x1

Basaloid pilomatricoma

Basaloid pilomatricoma

Basaloid pilomatricoma

Basaloid pilomatricoma

Basaloid pilomatricoma

Basaloid pilomatricoma

Pilomatricoma



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