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Ex Vivo Confocal Laser Scanning Microscopy for Real-Time Pattern and Single-Cell Analysis in Inflammatory Skin

D Hartmann1,2, L Stärr1, M Maurer1

  • 1Department of Dermatology and Allergy, LMU University Hospital, LMU Munich, Munich, Germany.

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|November 18, 2025
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Summary

Ex vivo confocal laser scanning microscopy (EVCM) shows promise for differentiating inflammatory skin diseases like eczema and psoriasis. This technique offers rapid visualization, aiding diagnosis when used alongside traditional histopathology.

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Area of Science:

  • Dermatology
  • Medical Imaging
  • Pathology

Background:

  • Inflammatory skin diseases present diagnostic challenges.
  • Accurate differentiation is crucial for effective treatment.
  • Ex vivo confocal laser scanning microscopy (EVCM) is an emerging imaging technique.

Purpose of the Study:

  • To evaluate the diagnostic utility of EVCM in distinguishing between eczema, psoriasis, and lichen planus.
  • To compare EVCM's diagnostic performance against gold standard histopathology.
  • To assess the impact of observer experience on EVCM diagnostic accuracy.

Main Methods:

  • 110 patient tissue samples underwent both EVCM and histopathology.
  • EVCM images were analyzed by blinded observers using pattern and single-cell analysis.
  • Statistical methods included sensitivity, specificity, Cohen's Kappa, and Firth's logistic regression.

Main Results:

  • EVCM provided rapid visualization of characteristic inflammatory dermatological disease features.
  • Diagnostic accuracy varied with observer expertise.
  • A specialist proficient in both EVCM and histopathology achieved high accuracy for lichen planus (97.27%), psoriasis (95.45%), and eczema (92.73%).

Conclusions:

  • EVCM is a valuable adjunct to histopathology for inflammatory skin diseases.
  • It offers swift and meaningful visualization, potentially expediting diagnosis.
  • Further validation is needed for routine clinical integration.