A Comprehensive Review of the Newest World Health Organization (WHO) Cytopathology Reporting Systems

World Health Organization cytopathology reporting system systems have proposed for the pancreatobiliary tract, lung, lymph node, and soft tissue aligned with the updates in the World Health Organization classification of Tumor series. Among them, the pancreatobiliary tract and lung specimen reporting system have been published recently and are now a 7-tier and 5-tier category system, respectively, without any subcategorization. World Health Organization reporting systems also encourage the application of ancillary diagnostic tests like cell block preparation, immunocytochemistry, and rapid on-site evaluation for better categorization of specimens and further management, especially in indeterminate (atypical and suspicious for malignancy) and malignant cytology categories. In this brief review, we aim to provide a brief outline of both the systems and their clinical risk-based management strategies.