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Related Experiment Videos

The diameter of melanomas.

Emmy M Fernandez1, Klaus F Helm

  • 1Department of Dermatology and Pathology, Milton S. Hershey Medical Center of Penn State University, Hershey, Pennsylvania 17033, USA.

Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [Et Al.]
|September 10, 2004
PubMed
Summary

Many melanomas are smaller than 6 mm, challenging the ABCD rule. This study highlights that melanoma can present with varied appearances, emphasizing the need for vigilance beyond established diagnostic criteria.

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Area of Science:

  • Dermatology
  • Oncology
  • Pathology

Background:

  • The ABCD rule (Asymmetry, Border irregularity, Color variation, Diameter > 6 mm) aids melanoma detection.
  • Clinicians may miss melanomas that do not conform to the ABCD criteria.

Purpose of the Study:

  • To evaluate the sensitivity of the diameter component of the ABCD melanoma detection rule.
  • To determine the proportion of melanomas smaller than 6 mm.

Main Methods:

  • Retrospective analysis of 383 melanoma pathology reports.
  • Data collected included melanoma diameter, depth, location, patient age, and sex.
  • Statistical analysis using 95% confidence intervals and p-values to compare melanoma groups.

Main Results:

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  • 38.21% of analyzed melanomas measured 6 mm or less in diameter.
  • Melanomas larger than 6 mm were associated with older patients and greater Breslow's thickness.
  • Smaller melanomas (<6 mm) represent a significant portion of cases.

Conclusions:

  • A substantial number of melanomas are smaller than the 6 mm diameter threshold of the ABCD rule.
  • Melanoma presentation is variable, and the ABCD criteria are not absolute.
  • Early-stage melanomas can appear as small lesions, necessitating broader diagnostic considerations.