Spitz Nevus: Review and Update.

Area of Science:

• Dermatology
• Oncology
• Pathology

Background:

• Spitz nevi are uncommon melanocytic nevi, typically presenting in childhood as red, dome-shaped papules.
• While rare in adults, Spitz nevi can be pigmented and exhibit rapid growth, potentially reaching 1 cm within six months.
• Spitzoid neoplasms encompass typical Spitz nevus, atypical Spitz nevus, and spitzoid melanoma, necessitating careful diagnostic differentiation.

Purpose of the Study:

• To review the characteristics and diagnostic challenges of Spitz nevi.
• To highlight the importance of differentiating Spitz nevi from melanoma, particularly in pediatric cases.
• To discuss the role of ancillary studies in diagnosing challenging Spitzoid neoplasms.

Main Methods:

• Review of clinical and histopathological features of Spitz nevi.
• Discussion of differential diagnostic criteria for spitzoid neoplasms.
• Evaluation of immunohistochemistry and molecular techniques in challenging cases.

Main Results:

• Spitz nevi present distinct clinical and histological features, often mimicking melanoma.
• Rapid growth is a common characteristic of Spitz nevi.
• Immunohistochemistry and molecular studies assist in differentiating difficult cases, but predictive criteria for atypical Spitz nevi remain elusive.

Conclusions:

• Accurate diagnosis of Spitz nevi is crucial, especially in children, to distinguish benign lesions from malignant melanoma.
• While diagnostic tools are improving, predicting the biological behavior of atypical Spitz nevi remains a challenge.
• Further research is needed to establish definitive criteria for managing atypical Spitz nevi.