Who Classification Of Skin Tumours -

: "Primary cutaneous NUT (Nuclear protein in testis) carcinoma" is included as a new provisional entity. 4. Adnexal & Soft Tissue 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).

: A new chapter focusing on the adverse prognostic implications of systemic cancers metastasizing to the skin. WHO Classification of Skin Tumours

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

: 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 : "Primary cutaneous NUT (Nuclear protein in testis)

: Entities are now generally listed in order from benign to malignant within each section to better reflect their neoplastic progression and clinical aggressiveness.

: Significant updates were made to dendritic cell and histiocytic neoplasms, as well as T-cell and NK-cell disorders. : A new chapter focusing on the adverse

: Updates focus on high-risk subtypes. Sarcomatoid differentiation is now the primary acknowledged uncommon subtype of Squamous Cell Carcinoma (SCC).