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Dermatoscopic pitfalls in differentiating pigmented Spitz naevi from cutaneous melanomas
G Argenziano1, M Scalvenzi, S Staibano
1Department of Dermatology, Federico II University of Naples, Naples, Italy.
The British Journal of Dermatology
|December 3, 1999
Summary
Epiluminescence microscopy (ELM) aids in diagnosing skin lesions. While typical patterns distinguish Spitz naevi (PSN) from melanomas (CM), overlapping features in PSN and CM pose diagnostic challenges, especially in atypical cases.
Area of Science:
- Dermatology
- Pathology
- Medical Imaging
Background:
- Epiluminescence microscopy (ELM), also known as dermoscopy, is crucial for diagnosing pigmented skin lesions.
- Established ELM criteria exist for differentiating Spitz naevi (PSN) from cutaneous melanomas (CM).
Purpose of the Study:
- To describe the ELM appearance of PSN, focusing on cases with overlapping features with CM.
- To identify diagnostic challenges and potential pitfalls in differentiating PSN from CM using ELM.
Main Methods:
- Clinical, dermatoscopic, and histopathological evaluation of 36 PSN and 3 CM cases with 'spitzoid' ELM features.
- Analysis of ELM patterns, including starburst, globular, and atypical features.
Main Results:
- 75% of PSN showed typical starburst or globular ELM patterns.
- 25% of PSN exhibited atypical ELM features (uneven color/structure, blue-white veil, irregular blotches), more common in CM.
- CM cases displayed less recognizable malignancy criteria, with some showing PSN-typical patterns.
Conclusions:
- Overlap in ELM features between PSN and CM presents a diagnostic pitfall.
- Clinical history, particularly patient age and lesion change, is vital for diagnosing atypical cases where ELM is ambiguous.