Dermoscopy Pattern

https://dermnetnz.org/cme/dermoscopy-course/pattern-analysis

Dermoscopy. Pattern analysis

 

Global pattern

• Reticular pattern (diffuse or patchy network)
• Globular pattern (globules in shades of brown)
• Homogeneous pattern (diffuse colour)
• Starburst pattern (uniform peripheral radial streaks, dots or globules)
• Parallel pattern (along furrows; palms and soles only)
• Complex pattern (2 patterns within a single lesion, usually symmetrically or regularly distributed)
• Multicomponent pattern (3 patterns, usually concentric)

Local features

• Pigment network, evenly spaced, fading out
• Dots/globules distributed regularly
• Streaks distributed regularly
• Central hypopigmentation
• Symmetrical blotches
• Comma-like regular vasculature
• On face: regular pseudonetwork
• On palms/soles: Parallel furrow, lattice-like or fibrillar pattern

Melanoma

Global pattern

• Multicomponent pattern (3 or more patterns)
• Unspecific pattern (mainly structureless or 2 patterns, irregular)
• Parallel pattern (along ridges; palms and soles only)

Local features

• Atypical pigment network (branched, broken-up, thickened, asymmetrical)
• Dots/globules distributed irregularly and of different sizes and shapes
• Asymmetrical blotches (featureless colours)
• Focal irregular streaking or peripheral linear projections (radial streaming and pseudopods)
• Five or six colours (black, brown, tan, grey, blue, red, white)
• Blue-white veil over part of the lesion
• White scar-like depigmentation
• Blue pepper-like granules
• Irregular linear or dotted vessels, or polymorphous vascular pattern especially with milky-red areas
• On face: grey dots, pseudonetwork, rhomboidal structures, asymmetrical pigmented follicles, annular-granular structures
• On palms/soles: parallel ridge, irregular