title: Colonisation of basal cell carcinoma by lentigo maligna: a case report, review of the literature, and series follow-up.
abstract: BACKGROUND
  Melanocytic tumours which colonise basal cell carcinomas (BCC) may be considered as either lentigo maligna (LM) (in situ) or invasive melanomas.
  
  
  OBJECTIVE
  To highlight the diagnostic approach and long-term prognosis of LM which colonises BCC.
  
  
  METHODS
  Using Satter et al.'s classification, we identified a case of BCC colonised by LM and reviewed similar cases in the literature with long-term follow-up.
  
  
  RESULTS
  In the absence of melanocytic extension beyond the lamina propria of the BCC compartment, mixed tumours may be considered as LM colonising the BCC, allowing for less invasive surgery. The absence of long-term relapse in our short series supports this diagnosis, rather than invasive melanomas.
  
  
  CONCLUSIONS
  Our case report, review of the literature, and series follow-up illustrate the most recent assessment of melanocytic/BCC tumours, and guide the physician and the pathologist in their recognition and classification, thus allowing them to make the most appropriate therapeutic decisions.
authors.affiliation: Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, CH-1011 Lausanne, Switzerland.
authors.forename: François
authors.initials: F
authors.lastname: Kuonen
authors.affiliation: Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, CH-1011 Lausanne, Switzerland.
authors.forename: Josef
authors.initials: J
authors.lastname: Aschwanden
authors.affiliation: Department of Pathology and Microbiology, University of Nebraska Medical Center, Omaha, NE, USA.
authors.forename: Dominick J
authors.initials: DJ
authors.lastname: Dimaio
authors.affiliation: Ackerman Academy of Dermatopathology, 145 East 32nd Street, New York, NY, USA.
authors.forename: Dirk M
authors.initials: DM
authors.lastname: Elston
authors.affiliation: Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, CH-1011 Lausanne, Switzerland.
authors.forename: Michel
authors.initials: M
authors.lastname: Gilliet
authors.affiliation: Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, CH-1011 Lausanne, Switzerland.
authors.forename: Daniel
authors.initials: D
authors.lastname: Hohl
authors.affiliation: Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, CH-1011 Lausanne, Switzerland.
authors.forename: Olivier
authors.initials: O
authors.lastname: Gaide
mesh_terms: D000368:Aged; D002280:Basal Cell Carcinoma / Q000737:chemistry / Q000473:pathology*; D005142:Eyelid Neoplasms / Q000737:chemistry / Q000473:pathology*; D005260:Female; D006801:Humans; D018327:Hutchinson's Melanotic Freckle / Q000737:chemistry / Q000473:pathology*; D018193:Neoplasms, Complex and Mixed / Q000737:chemistry / Q000473:pathology*; D012878:Skin Neoplasms / Q000737:chemistry / Q000473:pathology*
keywords: basal cell carcinoma; colonization; lentigo maligna; long-term outcome; melanocytic tumor