title: Dermoscopic Features of Onychomatricoma: A Study of 34 Cases.
abstract: BACKGROUND
  Onychomatricoma is a benign tumor of the nail matrix with a precise histopathological definition but many different clinical features and differential diagnoses.
  
  
  OBJECTIVE
  The diagnosis of onychomatricoma is based on the pathological examination of a surgical specimen. The objective of this study was to define preoperative diagnostic criteria using noninvasive investigations: observation and dermoscopy.
  
  
  METHODS
  A total of 34 cases of onychomatricoma were studied. In detail, 6 observers evaluated 12 clinical and 12 dermoscopical criteria as present or absent.
  
  
  RESULTS
  For clinical criteria, the highest mean values were leuconychia (3.21), splinter hemorrhages (3.45), and thickening of the plate (3.0). Dermoscopical criteria were more often found present, such as longitudinal parallel white lines (4.33), parallel lesion edges (4.61), splinter hemorrhages (4.48), dark dots (3.96), free-edge nail pitting (4.5), and thickening of the free edge (5.27).
  
  
  CONCLUSIONS
  Dermoscopical criteria for onychomatricoma are more frequently present and less subject to divergent interpretation. This offers new and original preoperative reliable diagnostic criteria and should be used in the evaluation of nail tumors.
authors.affiliation: Department of Dermatology, Centre Hospitalier Lyon-Sud - Pierre Bénite, Hospices Civils de Lyon, Lyon, France.
authors.forename: Cecile
authors.initials: C
authors.lastname: Lesort
authors.forename: Sébastien
authors.initials: S
authors.lastname: Debarbieux
authors.forename: Gerard
authors.initials: G
authors.lastname: Duru
authors.forename: Stephane
authors.initials: S
authors.lastname: Dalle
authors.forename: Nicolas
authors.initials: N
authors.lastname: Poulhalon
authors.forename: Luc
authors.initials: L
authors.lastname: Thomas
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D046169:Dermoscopy; D005260:Female; D006470:Hemorrhage / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009260:Nail Diseases / Q000150:complications / Q000473:pathology*; D012878:Skin Neoplasms / Q000150:complications / Q000473:pathology*