WHO Classification of Tumours Online presents the authoritative content of the renowned classification series in a convenient digital format. Now combining the thirteen 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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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.
The printed volumes will be available soon. To be informed about the book release please register here.

The definitive resource for tumour classification worldwide

The concise and authoritative information that characterizes the print books, enhanced with whole slide images and zoom

Trustworthy content

Compiled and reviewed by an international editorial board

Whole slide images

Digital pathology enhancements

Deep zoom functionality

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Volumes from 2017 to present

The 13 most recent volumes from the 4th and 5th editions

Regularly updated

New volumes are continually added

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Enhanced authoritative content

The WHO Classification of Tumours series you've been relying on for years are now available as a convenient online subscription, including new features such as whole slide images, favourite sections and personal notes.

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