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Direct immunofluorescence staining patterns compared between oral and cutaneous lichen planus.

C Rujitharanawong1, P Tuchinda1, L Chularojanamontri1

  • 1Department of Dermatology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.

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Direct immunofluorescence (DIF) in oral and cutaneous lichen planus (LP) shows distinct patterns. Fibrin deposition at the dermoepidermal junction is a key indicator for diagnosing oral LP.

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Area of Science:

  • Immunodermatology
  • Oral Pathology

Background:

  • Lichen planus (LP) is an inflammatory condition affecting skin and mucous membranes.
  • Direct immunofluorescence (DIF) is a diagnostic tool for autoimmune blistering diseases and other conditions.

Purpose of the Study:

  • To investigate and compare direct immunofluorescence (DIF) findings in oral and cutaneous lichen planus (LP).
  • To identify differences in DIF patterns between oral and cutaneous LP.
  • To determine the most reliable DIF indicator for oral LP diagnosis.

Main Methods:

  • Retrospective analysis of 147 patients with diagnosed LP (87 oral, 60 cutaneous).
  • Evaluation of direct immunofluorescence (DIF) findings, including immunoreactant deposition at the dermoepidermal junction (DEJ) and colloid bodies (CBs).
  • Statistical comparison of DIF results between oral and cutaneous LP groups.

Main Results:

  • Overall positive DIF yield was 85%, lower in oral LP (79.3%) than cutaneous LP (93.3%).
  • Significantly greater immunoreactant deposition at the DEJ in oral LP compared to cutaneous LP.
  • Fibrin deposition with a shaggy pattern at the DEJ was significantly more prevalent in oral LP.
  • Immunoreactant deposition at colloid bodies (CBs) was more frequent in cutaneous LP.

Conclusions:

  • Direct immunofluorescence (DIF) reveals distinct patterns in oral and cutaneous lichen planus (LP).
  • Fibrin deposition with a shaggy pattern at the dermoepidermal junction (DEJ) is proposed as the most sensitive diagnostic marker for oral LP.
  • Understanding these DIF differences aids in accurate diagnosis and differentiation of LP subtypes.