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SYMMETRY AND ASYMMETRY

Mirror Image Technique

  • The lesion is bisected by 2 lines that are placed 90° to each other.

  • One does not physically place lines over the lesion; the lines are visually imagined.

  • The lines should be placed to create as much symmetry as possible.

  • Are the color and/or the structure on the left half of the lesion a mirror image of the right half?

  • Repeat the analysis for the upper and lower half of the lesion.

TABLE 2-1Global Patterns: Global pattern is the overall dermoscopic picture of a lesion.

RETICULAR GLOBAL PATTERN

Pigment Network Filling Most of the Lesion

GLOBULAR GLOBAL PATTERN

Dots and Globules Filling Most of the Lesion

COBBLESTONE GLOBAL PATTERN

Larger Angulated Globules Resembling Street Cobblestones Filling Most of the Lesion

HOMOGENEOUS GLOBAL PATTERN

Diffuse Pigmentation in the Absence of Local Criteria Such as Pigment Network, Dots, and Globules

STARBURST (SPITZOID)

Streaks (black arrows) and/or Dots and Globules (red arrows) at the Periphery of ...

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