The spitz nevus: review and update.

Area of Science:

• Dermatopathology
• Oncology
• Pediatric Dermatology

Background:

• Spitz nevi are common skin lesions in children, characterized by specific cell types under microscopy.
• These lesions can mimic melanoma, posing diagnostic challenges, especially with atypical features.
• A spectrum exists from benign Spitz nevi to malignant melanoma, with diagnostic variability.

Purpose of the Study:

• To review the diagnostic challenges associated with Spitz lesions.
• To highlight the difficulties in differentiating Spitz nevi from melanoma.
• To discuss recent advancements in ancillary testing for improved diagnosis.

Main Methods:

• Review of light microscopic features of Spitz lesions.
• Discussion of diagnostic criteria and interobserver variability.
• Exploration of emerging ancillary testing methods.

Main Results:

• Spitz lesions exhibit a range of features, from benign to melanoma-like.
• Distinguishing typical Spitz nevi from melanoma can be difficult due to overlapping features.
• Significant interobserver variation exists in the interpretation of Spitz lesions.

Conclusions:

• Accurate pathologic interpretation of Spitz lesions is challenging due to diagnostic terminology and criteria.
• Ancillary testing shows promise for better defining the biologic nature of Spitz lesions.
• Advancements in testing are expected to improve differentiation between benign and malignant lesions, aiding treatment decisions.