A 51-year-old patient consulted for this lesion located on his back.
Dermoscopy revealed :
This lesion was a basal cell carcinoma.
Crystalline or chrysalis structures are white shiny streaks that can only be seen with
polarized dermatoscopes. Crystaline or chrysalis structures are most commonly observed in basal cell carcinoma
and invasive melanomas and rarely seen in nevi. In melanoma,they reflect increased tumor thickness
and progression. The significance of crystalline/chrysalis structures in
the diagnosis of melanocytic and nonmelanocytic
lesions. Y. Balagula, R.P. Braun, H. S. Rabinovitz et al. J Am Acad Dermatol 2012;67:194.e1-8.
A 75-year-old man consulted for this pigmented lesion on his back.
His skin was heavily sun exposed.
Clinical image is in the lower right corner.
- an atypical reticular network with different colours and disorganization
- a blue structureless area
This lesion was excised and pathology revealed a superficial spreading melanoma. Breslow index was 0,30 mm.