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Related Experiment Videos

AA line

S K Ahn1, S J Kim, E H Choi

  • 1Department of Dermatology, Yonsei University Wonju College of Medicine, South Korea.

International Journal of Dermatology
|April 29, 1998
PubMed
Summary
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A newly identified transverse skin line on the forearm, termed the AA line, affects 36.4% of individuals, particularly females and adolescents. Histopathology reveals subtle collagen changes and vasodilation, suggesting a distinct dermatological finding.

Area of Science:

  • Dermatology
  • Human Anatomy

Background:

  • A common transverse skin line on the upper forearm lacks clear definition and correlation with other known skin lines.
  • Previous characterization of this common dermatological feature is limited.

Purpose of the Study:

  • To define the transverse skin line of the upper forearm.
  • To investigate its associated conditions.
  • To characterize its histopathologic features.

Main Methods:

  • Examination of 1343 healthy Korean individuals.
  • Clinical evaluation of individuals presenting with the transverse skin line.
  • Dermal biopsies from lesional and contralateral sites in 10 individuals.

Main Results:

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  • The transverse skin line was observed in 480 individuals (36.4%).
  • Higher incidence noted in females and individuals aged 10-19 years.
  • Histopathology revealed subtle edema, collagen fragmentation, and vasodilation.

    • Conclusions:

    • The transverse skin line represents a newly defined dermatological feature.
    • The term "AA line" is proposed for this newly defined skin line.