title: [Malherbe's calcifying epithelioma (pilomatrixoma)].
abstract: Malherbe's calcifying epithelioma (pilomatrixoma)--is a rare, benign tumor of hair matrix.
  
  
  OBJECTIVE
  Of this study is to present the clinical variability of epithelioma, pathomorfological appearance of the tumor and the views on its pathogenesis.
  
  
  RESULTS
  Malherbe's calcifying epithelioma has a very different, sometimes unusual appearance, similar to other, more frequent laesions. Due to this fact and the rarity of the tumor it is sometimes overlooked in diagnostic considerations, or confused with more common tumors. Genetic analysis at this stage, allows to establish a probable causal relationship between mutations in the beta-catenins coding gene and development of pilomatrixoma. Extremely rare epithelioma may undergo transformation into pilomatrix carcinoma.
  
  
  CONCLUSIONS
  The only reliable criterion of diagnosis remains pathological evaluation which despite the deceptive macroscopic appearance of the tumor provides correct diagnosis.
authors.affiliation: Z Katedry i Kliniki Okulistyki i Onkologii Okulistycznej Uniwersytetu Jagiellońskiego Collegium Medicum w Krakowie.
authors.forename: Ewa
authors.initials: E
authors.lastname: Czerniawska
authors.forename: Arkadiusz
authors.initials: A
authors.lastname: Pogrzebielski
authors.forename: Bozena
authors.initials: B
authors.lastname: Romanowska-Dixon
mesh_terms: D003937:Diagnosis, Differential; D006201:Hair Diseases / Q000175:diagnosis* / Q000473:pathology* / Q000601:surgery; D006801:Humans; D018296:Pilomatrixoma / Q000175:diagnosis* / Q000473:pathology* / Q000601:surgery; D012878:Skin Neoplasms / Q000175:diagnosis* / Q000473:pathology* / Q000601:surgery