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Keywords:

  • birefringent needle-shaped crystals;
  • transepidermal elimination;
  • transient perforating disorder;
  • urate-like crystals

We report two men who developed a transient perforating disorder characterized by transepidermal elimination of negatively birefringent needle-shaped crystals similar to monosodium urate. This striking clinical presentation has not previously been described and we propose that it be added to the group of diseases known as the primary perforating disorders.