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Tuesday 10 June 2008

Fibrillar pattern

A 35-year-old woman consulted for a pigmented lesion on the sole of her left foot.
The dermoscopic feature was typical of a fibrillar pattern.
The fibrillar pattern was uniform and localized on the entire surface of the lesion. That was in favor of a benign acral melanocytic nevus.

The fibrillar pattern is a subtype of parallel furrow pattern observed on high-pressure areas and in hyperkeratotic areas.
Fibrillar pattern are quite never observed on palmar surface.
It has to be reminded that fibrillar pattern is in favor of a benign acral nevus only if it occupies the whole surface of the lesion. Melanomas can dysplay a fibrillar pattern in focal areas in a disorganized manner.

Braun RP, Kopf AW, Marghoob AA. Comment on dermoscopy patterns of melanocytic nevi on the sole. J Am Acad Dermatol 2006; 55: 162-3

Other cases of fibrillar pattern: 1 2 3

Other cases of acral nevi:
1  2  3  4  5  6  7  8  9  10  11