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.

Reference:
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:

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Fibrillar pattern

A 48-year-old woman noticed a pigmented lesion on the right side of her right foot.
Dermoscopy revealed a fibrillar pattern in favor of a benign acral melanocytic nevus.

Fibrillar pattern is a variant of parallel furrow pattern.

Fibrillar pattern

This patient presented a benign acral melanocytic nevus with a typical fibrillar pattern

Fibrillar pattern

A 56-year-old woman presented a plantar nevus on her right foot, located on the lateral area. Dermoscopy revealed a typical fibrillar pattern (or filamentous pattern).