Dysplastic Nevi for Dummies: Histopathology

The presentation focuses on the histopathology of dysplastic nevi, highlighting the controversies and challenges in terminology and classification among dermatopathologists. Despite a notable turnout and engagement from the audience, the speaker addresses issues such as the lack of consensus on nomenclature, with only about 25% concordance rate among dermatopathologists when classifying dysplastic nevi. The importance of standardized definitions, like those proposed by the EMpath effort, is emphasized to improve research and clinical application. The histopathology features that characterize dysplastic nevi include architectural and cytological atypia, which are graded as mild, moderate, or severe depending on their resemblance to melanoma. The speaker provides visual examples to illustrate these categories, explaining how even slight differences in cellular arrangement and morphology can indicate varying levels of risk. The discourse concludes with an acknowledgment of the need for a uniform approach in diagnosing and studying melanocytic lesions to better understand their biological implications and improve accuracy in diagnosis. Ultimately, while some may see dysplastic nevi as a direct spectrum to melanoma, the speaker prompts the audience to consider the complexities that question that simplicity.