BMJ Case Reports 2017; doi:10.1136/bcr-2016-218574

An unusually large onychomatricoma

  1. Hugo Barreiros2
  1. 1 Department of Internal Medicine, Hospital Garcia de Orta, Almada, Portugal
  2. 2 Department of Dermatology, Hospital Garcia de Orta, Almada, Portugal
  1. Correspondence to Dr Pedro Beirão, pbeirao{at}
  • Accepted 3 April 2017
  • Published 21 April 2017


Onychomatricoma is a rare benign tumour of the nail matrix first described in 1992, and since then, no more than 80 cases have been reported. Despite distinct clinical characteristics, it is frequently misdiagnosed as onychomycosis partly due to remaining an unknown entity. The authors present the case of a patient with a 30-year history of nail abnormalities with more recent growth to alarming dimensions.


  • Contributors PB: Design of the case report, acquisition of data, writing of the main body of the work and bibliographic research. PP: Bibliographic research and review. AN: Image acquisition, selection and review. HB: Final review.

  • Competing interests None declared.

  • Patient consent Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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