Tumours: Who Classification Of Skin

: Continues to be categorized separately from traditional SCC. 3. New Sections & Provisional Entities

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

: Each tumour entry includes clear "essential" diagnostic features and "desirable" criteria to improve diagnostic reliability worldwide. Major Clinical Updates by Category 1. Melanocytic Neoplasms : Continues to be categorized separately from traditional

: The 5th edition (WCT5) organizes tumours into a rigid hierarchy: Site → Category → Family → Type → Subtype . WHO Classification of Skin Tumours