Histology Course S I 19 Department of Pathology, University of Zurich Histokurs

S I 19 lichen ruber HE further information (German) on HiPaKu
  ICD-10: L43.9

50-year-old female with white-grey, velvety plaque arranged in stripes. Predominantly in the oral mucosa, also on tongue and uvula.

- Hyperkeratotic epithelium (without substantial parakeratosis)
- Saw-like elongated rete ridges
- Degeneration of the basal cell layer
- Strip of predominantly lymphocytic, well demarcated infiltrate closely apposed to the epithelium with sporadic histiocytes.