title: Follicular baso-squamous melanocytic tumour of the skin.
abstract: OBJECTIVE
  We describe a previously unrecognized pigmented tumour of the skin and suggest a possible relationship with the follicular bulb.
  
  
  RESULTS
  A pigmented epithelial neoplasm clinically simulating a malignant melanoma of the skin was present in a 92-year-old woman, on her left leg. It was composed of three cell types: squamous cells with trichilemmal keratinization, basaloid cells and dendritic melanocytes. The presence of three cell types was confirmed by immunohistochemistry and electron microscopy.
  
  
  CONCLUSIONS
  The tumour showed differentiation towards the hair follicular bulb and the descriptive term of follicular baso-squamous melanocytic tumour is suggested.
authors.affiliation: Section of Anatomic Pathology, M Bufalini Hospital, Cesena, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Riccioni
authors.forename: G
authors.initials: G
authors.lastname: Cenacchi
authors.forename: T
authors.initials: T
authors.lastname: Ragazzini
authors.forename: G
authors.initials: G
authors.lastname: Collina
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008545:Melanoma / Q000145:classification* / Q000473:pathology* / Q000648:ultrastructure; D008854:Microscopy, Electron; D018307:Neoplasms, Squamous Cell / Q000473:pathology*; D012878:Skin Neoplasms / Q000145:classification* / Q000473:pathology* / Q000648:ultrastructure