The World Health Organization Reporting System for Lung Cytopathology.

Area of Science:

• Cytopathology
• Oncology
• Medical Diagnostics

Background:

• Lung cytopathology reporting lacks standardization, hindering consistent diagnosis and patient management.
• The International Academy of Cytology and International Agency for Research on Cancer collaborated to address this gap.

Purpose of the Study:

• To introduce the new World Health Organization (WHO) Reporting System for Lung Cytopathology.
• To establish standardized reporting categories, definitions, malignancy risks, and management algorithms for lung cytopathology.
• To enhance the global applicability and utility of lung cytopathology in diagnosis and personalized medicine.

Main Methods:

• Development of a consensus-based reporting system by international experts in lung cytopathology.
• Defined five reporting categories: Insufficient/Inadequate/Non-diagnostic, Benign, Atypical, Suspicious for malignancy, and Malignant.
• Incorporated best practices for ancillary testing (immunocytochemistry, molecular pathology) and sampling techniques.

Main Results:

• The WHO System provides clear descriptive terms, definitions, malignancy risk assessments, and management algorithms for each category.
• Key diagnostic cytomorphological features have been established.
• The system is designed for worldwide applicability, emphasizing cytomorphology for resource-limited settings.

Conclusions:

• The WHO System aims to standardize lung cytopathology reporting, improve communication, and enhance patient care.
• It supports the integration of molecular pathology and personalized medicine approaches.
• The system will raise the profile of cytopathology and guide future research.