Histology Course A III 21 Department of Pathology, University of Zurich Histology Course

A III 21 solar elastosis of the skin Orcein-Sirius further information (German) on HiPaKu 
  ICD-10: L57.8

72-year-old female exhibited an indurated area of the skin of the left cheek. Excision was performed.
- The architecture of epidermis, dermis and skin adnexa is maintained.
- The thickened dermis displays an increased amount of collagen fibers and plump, irregular elastic fibers (elastosis).
- Epidermis presents circumscribed acanthosis and hyperkeratosis. Neither parakeratosis nor dysplasia of epithelial cells is present.

Pathogenesis: Cumulative and intermittent exposure to sunlight.

Differential diagnosis: Damage to the skin due to X-ray radiation; usually marked sclerosis of the dermis with loss of skin adnexa.