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Fibrosis
           Melanin
Regression
Pattern Analysis
The differentiation of
melanocytic nevi from
     melanoma
The evaluation of
 melanocytic lesions:
 Colors
 Symmetry
 Organization
 Black Benign lesions generally
 Brown have 3 or less colors. The
        most common colors being
 Gray
        light brown, dark brown,
 Blue
        and black.
 Red
 White
 Yellow Malignant lesions generally
          have more than 3 colors.
Symmetry/ Asymmetry
Symmetry refers to the distribution of colors and
structures on either side of the axis and not the shape of
the lesion.




          Biaxial Symmetry    Monaxial Symmetry
Asymmetry
Asymmetry refers to the distribution of colors and
structures on either side of the axis; there is no
mirror image. Malignant lesions usually have
biaxial asymmetry




Monaxial Asymmetry           Biaxial Asymmetry
Organization/ Disorganization
Organization refers to
the uniformity of
structures and their
distribution in specific
locations as seen in
benign patterns.


Disorganization refers
to the non-uniformity of
structures and their
departure from benign
patterns.
Dermoscopic Patterns

                                   Malignant
                      Nevi         Melanoma
                               2

                         1           3


Dermoscopy helps the clinician decide which category the lesion
should be placed in:
      (1) Benign Patterns
      (2) Uncertain Patterns
      (3) Malignant Patterns
Benign Patterns




            Malignant
Nevi
            melanoma

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Slides 31 40

  • 1. Fibrosis Melanin
  • 3. Pattern Analysis The differentiation of melanocytic nevi from melanoma
  • 4. The evaluation of melanocytic lesions:  Colors  Symmetry  Organization
  • 5.  Black Benign lesions generally  Brown have 3 or less colors. The most common colors being  Gray light brown, dark brown,  Blue and black.  Red  White  Yellow Malignant lesions generally have more than 3 colors.
  • 6. Symmetry/ Asymmetry Symmetry refers to the distribution of colors and structures on either side of the axis and not the shape of the lesion. Biaxial Symmetry Monaxial Symmetry
  • 7. Asymmetry Asymmetry refers to the distribution of colors and structures on either side of the axis; there is no mirror image. Malignant lesions usually have biaxial asymmetry Monaxial Asymmetry Biaxial Asymmetry
  • 8. Organization/ Disorganization Organization refers to the uniformity of structures and their distribution in specific locations as seen in benign patterns. Disorganization refers to the non-uniformity of structures and their departure from benign patterns.
  • 9. Dermoscopic Patterns Malignant Nevi Melanoma 2 1 3 Dermoscopy helps the clinician decide which category the lesion should be placed in: (1) Benign Patterns (2) Uncertain Patterns (3) Malignant Patterns
  • 10. Benign Patterns Malignant Nevi melanoma