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Related Experiment Videos

Contiguous lesions in lentigo maligna.

Scott R Dalton1, Timothy L Gardner, Lester F Libow

  • 1Department of Pathology, Bassett Army Hospital, Ft. Wainwright, Alaska, USA.

Journal of the American Academy of Dermatology
|April 29, 2005
PubMed
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Nearly half of lentigo maligna cases (48%) feature adjacent pigmented lesions, often benign solar lentigos or actinic keratoses. Recognizing this common occurrence can prevent misdiagnosis due to biopsy sampling errors.

Area of Science:

  • Dermatology
  • Oncology
  • Pathology

Background:

  • Biopsy technique selection for suspected lentigo maligna is challenging.
  • Complete excisional biopsy is often impractical, necessitating careful selection of biopsy areas.
  • Sampling errors can lead to misdiagnosis, particularly when benign pigmented lesions are present.

Purpose of the Study:

  • To investigate the frequency of contiguous pigmented lesions adjacent to lentigo maligna.
  • To assess the diagnostic implications of these co-occurring lesions.

Main Methods:

  • Analysis of Mohs debulking specimens from lentigo maligna cases.
  • Examination of broad shave biopsy specimens from pigmented lesions on sun-damaged skin confirmed as lentigo maligna.

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Main Results:

  • Contiguous pigmented lesions were identified in 48% of studied specimens.
  • Benign solar lentigo was the most frequent adjacent lesion (30%), followed by pigmented actinic keratosis (24%).

Conclusions:

  • The frequent presence of adjacent pigmented lesions highlights a potential source of sampling error in lentigo maligna diagnosis.
  • Awareness of this phenomenon can improve diagnostic accuracy and patient management.