Who — Classification Of Skin Tumours

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The (5th Edition, 2025) is the authoritative global standard for diagnosing and categorizing cutaneous neoplasms. Also known as the "Blue Books," this edition shifts toward a more integrated, multidisciplinary approach that combines traditional histopathology with advanced molecular genetics and immunohistochemistry. Key Structural & Conceptual Changes WHO Classification of Skin Tumours

: The classification reaffirms the 9-pathway model for melanoma, which classifies lesions based on sun exposure (UV damage), anatomical site (e.g., acral, mucosal), and specific molecular drivers. This is for informational purposes only