WHO Classification of Tumours Online presents the authoritative content of the renowned classification series in a convenient digital format. Now combining the fourteen most recent volumes of the series in a searchable format, with high quality images and whole slide images.
WHO Classification of Tumours Online is indispensable for pathologists and cancer specialists worldwide. New volumes will be added regularly, ensuring immediate access to the latest content.

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Please take this survey about the revision of Soft Tissue and Bone Tumours,
before January 15, 2025.

The WHO Reporting Systems for Cytopathology are a joint project of the International Academy of Cytology, and the International Agency for Research on Cancer, a specialized agency of the World Health Organization. This series is a synthesis of the published evidence and the practice of cytopathology, linked to the WHO Classification of Tumours, now in their 5th Edition. Cytopathology reporting uses a hierarchial system of diagnostic categories. These categories are linked to diagnostic management recommendations to improve communication with clinicians and assist patient care.