Who Classification Of Skin Tumours (2025-2026)

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

: Progress in identifying gene fusions (e.g., YAP1::MAML2 in poromas) has enhanced diagnostic accuracy for sweat gland and hair follicle tumours. WHO Classification of Skin Tumours

: Continues to be categorized separately from traditional SCC. 3. New Sections & Provisional Entities The (5th Edition, 2025) is the authoritative global

: "Primary cutaneous NUT (Nuclear protein in testis) carcinoma" is included as a new provisional entity. 4. Adnexal & Soft Tissue Tumours : Continues to be categorized separately from traditional

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: Significant updates were made to dendritic cell and histiocytic neoplasms, as well as T-cell and NK-cell disorders.