The International System for Reporting Serous Fluid Cytopathology-An Updated Review

Area of Science:

• Cytopathology
• Oncology
• Medical Diagnostics

Background:

• Standardized reporting in serous fluid cytopathology is crucial for accurate diagnoses.
• The International System (TIS) for reporting serous fluid cytopathology was established in December 2020.
• Existing reporting lacked standardization, impacting diagnostic reproducibility and communication.

Purpose of the Study:

• To provide an updated summary of the International System (TIS) for reporting serous fluid cytopathology.
• To discuss the TIS five-tier system: nondiagnostic, negative for malignancy, atypia of uncertain significance, suspicious for malignancy, and malignant.
• To review risk of malignancy, diagnostic pitfalls, and a practical approach for serous fluid specimens.

Main Methods:

• Review of the published International System (TIS) for serous fluid cytopathology.
• Analysis of the TIS five-tier diagnostic categories.
• Synthesis of information on risk of malignancy and diagnostic challenges.

Main Results:

• The TIS provides a standardized five-tier system for serous fluid cytopathology reporting.
• Implementation of TIS aims to enhance diagnostic reproducibility and inter-observer agreement.
• The system categorizes specimens from nondiagnostic to malignant, guiding clinical management.

Conclusions:

• The International System (TIS) offers a standardized framework for serous fluid cytopathology.
• Understanding TIS is essential for accurate interpretation and improved patient care.
• This review highlights key aspects of TIS, including its application and potential challenges.