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: The MPATH-Dx V2.0 schema is proposed to help clinicians and pathologists communicate risk levels more effectively across four distinct classes. 2. Keratinocytic / Epidermal Tumours WHO Classification of Skin Tumours
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: Progress in identifying gene fusions (e.g., YAP1::MAML2 in poromas) has enhanced diagnostic accuracy for sweat gland and hair follicle tumours. Learn more : The MPATH-Dx V2
: A new chapter focusing on the adverse prognostic implications of systemic cancers metastasizing to the skin.
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
: 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.