Lichenoid keratosis

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Lichenoid keratosis is a benign skin condition.

It is also known as lichen planus-like keratosis.

General

Clinical DDx:[1]

Microscopic

Features:[2]

  • Hyperkeratosis.
  • Parakeratosis.
  • Band of inflammatory cells at DE junction (lichenoid inflammation).
  • Dead keratinocytes (Civatte bodies).
  • Dermal melanophages.

DDx:

Images

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SKIN LESION, MID-MIDDLE BACK, PUNCH BIOPSY:
- LICHENOID KERATOSIS.

Incompletely excised

SKIN LESION, LEFT CHEST, PUNCH BIOPSY:
- LICHENOID KERATOSIS VERSUS ACTINIC KERATOSIS.
- NEGATIVE FOR BASAL CELL CARCINOMA.
- SEE COMMENT.

COMMENT:
No eosinophils are apparent. No melanocytic lesion is identified; however, excision of the
whole lesion to exclude a partially regressed melanocytic lesion is suggested.

Micro

The sections show skin with lichenoid inflammation and mild overlying hyperkeratosis with very rare parakeratosis. There is no significant basal atypia. Rare eosinophils are seen. The lymphocytes do not show apparent atypia. Mild reactive spongiosis is seen.

See also

References

  1. 1.0 1.1 Busam, Klaus J. (2009). Dermatopathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Saunders. pp. 346. ISBN 978-0443066542.
  2. Busam, Klaus J. (2009). Dermatopathology: A Volume in the Foundations in Diagnostic Pathology Series (1st ed.). Saunders. pp. 347. ISBN 978-0443066542.