Alopecia areata with lymphocytic mural folliculitis affecting the isthmus in a thoroughbred mare

Silvia Colombo, John A Keen, David G Brownstein, Susan M Rhind, Bruce C McGorum, Peter B Hill

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A 13-year-old, thoroughbred mare was presented with an 8-year history of multifocal, generalized, noninflammatory alopecia and a 3-month history of alopecia, erythema and scaling of the white star on the forehead and muzzle. Histopathological examination of biopsy samples from multiple sites on the body (mane, neck, shoulder, flank and gluteal region) showed a subtle lymphocytic inflammatory infiltrate affecting and surrounding the anagen hair bulbs, consistent with a diagnosis of alopecia areata. The biopsy sample from the star on the forehead showed atrophic hair follicles with perifollicular and mural mononuclear folliculitis affecting the isthmus. Immunohistochemical staining with a CD3 marker confirmed the T-lymphocytic origin of the inflammatory infiltrate in all the samples. The concurrent presence of lymphocytic infiltration at the bulbar and isthmic level of the hair follicles in the same horse is unusual. This finding may represent a variation of the histological appearance of alopecia areata.
Original languageEnglish
Pages (from-to)260-5
Number of pages6
JournalVeterinary Dermatology
Issue number4
Publication statusPublished - 2004

Keywords / Materials (for Non-textual outputs)

  • Alopecia Areata
  • Animals
  • Biopsy
  • Diagnosis, Differential
  • Female
  • Folliculitis
  • Horse Diseases
  • Horses


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