Seborrheic Keratosis Features

SK1ah

  • ┬áDefined area of contained epidermal thickening
  • Heterogeneous texture a result of dyskeratosis
  • Appearance of repeating ridges and fissures on the skin surface mirrored by the DEJ contour

SK3

  • Fissures can be filled with hyporeflective layered keratin

SK2

SK2ano

  • SKs can also appear without surface ridges in the flat form
  • Keratin cysts are more noticeable in this form as hyperreflective structures embedded in the thickened epidermis

SK4

SK4ano

  • Flat SKs can often be similar in appearance to junctional nevi in terms of DEJ presentation
  • These can be distinguished from nevi by identifying hyperreflective structures within the epidermal thickening corresponding to keratin cysts and deposits

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