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Related Experiment Videos

Nonmelanocytic lesions defying the two-step dermoscopy algorithm.

Alon Scope1, Cristiane Benvenuto-Andrade, Anna Liza C Agero

  • 1Dermatology Service, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, New York 10022, USA.

Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [Et Al.]
|November 7, 2006
PubMed
Summary
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Dermoscopy

Area of Science:

  • Dermatology
  • Dermoscopy
  • Oncology

Background:

  • The two-step algorithm in dermoscopy differentiates melanocytic from nonmelanocytic lesions.
  • Some nonmelanocytic lesions mimic melanocytic lesions dermoscopically, challenging initial diagnosis.

Purpose of the Study:

  • To raise clinician awareness of nonmelanocytic lesions that defy the standard two-step dermoscopy algorithm.
  • To highlight specific dermoscopic features that can be misleading, simulating melanocytic nevi.

Main Methods:

  • Review of dermoscopic criteria for common nonmelanocytic lesions.
  • Comparison of dermoscopic features of nonmelanocytic lesions with those of melanocytic lesions.
  • Identification of specific nonmelanocytic lesions presenting with features typically associated with melanocytic nevi.

Related Experiment Videos

Main Results:

  • Nonmelanocytic lesions like seborrheic keratosis, solar lentigo, dermatofibroma, and supernumerary accessory nipples can exhibit network-like structures.
  • Pigmented globules are observed in seborrheic keratosis, dermatofibroma, subcorneal hemorrhage, basal cell carcinoma (BCC), and cutaneous metastases.
  • Peripheral streaks are noted in seborrheic keratosis and BCC; homogenous bluish pigmentation can be seen in vascular lesions, Kaposi sarcoma, radiation tattoo, and BCC.

Conclusions:

  • Certain nonmelanocytic lesions share dermoscopic features with melanocytic lesions, potentially leading to misdiagnosis.
  • A holistic integration of all observed dermoscopic features, rather than a stepwise approach, may improve diagnostic accuracy for challenging cases.