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.
: Significant updates were made to dendritic cell and histiocytic neoplasms, as well as T-cell and NK-cell disorders. WHO Classification of Skin Tumours
: This term is now used for "intermediate" lesions that exhibit borderline biological behavior but have specific molecular signatures (e.g., BAP1 inactivation or WNT pathway alterations). : The classification reaffirms the 9-pathway model for
: The 5th edition (WCT5) organizes tumours into a rigid hierarchy: Site → Category → Family → Type → Subtype . anatomical site (e.g.
: 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