Common Dermoscopic Patterns: A Visual Reference
Understanding dermoscopic patterns is essential for accurate diagnosis. This visual guide covers the most important patterns dermatologists encounter in daily practice.
Dermoscopic patterns provide crucial diagnostic clues. This reference guide covers the key patterns every dermatologist should recognize.
Pigment Networks
The pigment network is the classic dermoscopic hallmark of melanocytic lesions. It consists of a grid of dark lines (rete ridges) with hypopigmented holes (dermal papillae).
- Typical network: Regular, mesh-like pattern found in benign nevi
- Atypical network: Irregular, thick lines associated with melanoma
- Polygonal lines: Honeycomb pattern seen in dermatofibromas
Globules
Brown to black rounded structures typically found at the periphery of nevi. Their presence in the center of a lesion warrants concern.
Streaks
Linear structures extending from the lesion edge:
- Pseudopods: Bulbous, finger-like projections
- Radial streaming: Radiating parallel lines
Both are concerning features associated with melanoma.
Vascular Patterns
Blood vessels provide critical diagnostic information:
- Comma vessels: Curved, short vessels in benign lesions
- Corkscrew vessels: Twisted, helical vessels in SCC and melanoma
- Dotted vessels: Small, pinpoint vessels in various conditions
Special Structures
Blue-white veil, shiny white streaks, and ulceration are high-risk features that should prompt biopsy consideration.