Pleural fluid cytology: immunocytochemistry usage patterns and significance of nondefinitive diagnoses

Area of Science:

• Cytopathology
• Thoracic Medicine
• Oncology

Background:

• Limited research exists on the practical interpretation of pleural fluid cytology.
• The utilization of immunocytochemistry and the frequency of nondefinitive diagnoses in routine practice are not well-documented.

Purpose of the Study:

• To retrospectively analyze pleural fluid cytology reports to assess diagnostic practices.
• To evaluate the use of immunocytochemistry and its impact on definitive diagnoses.
• To examine patient survival rates in relation to cytologic diagnosis and clinical suspicion of malignancy.

Main Methods:

• Retrospective review of 1,330 pleural fluid reports from 1991-1997.
• Analysis of cytologic diagnosis, requisition form history, and patient survival data.
• Assessment of immunocytochemistry usage and its diagnostic contribution.

Main Results:

• Nondefinitive cytologic diagnoses were rendered in 11.3% of cases.
• Immunocytochemistry was employed in only 2.6% of cases but aided definitive diagnosis in 71.9% of those instances.
• Patients with a history of malignancy and clinical suspicion of recurrence exhibited dismal survival rates, irrespective of the cytologic diagnosis.

Conclusions:

• The use of immunocytochemistry in pleural fluid analysis is sparse but valuable for achieving definitive diagnoses.
• In cases of suspected malignancy recurrence, patient prognosis is poor, highlighting the need for accurate and timely diagnosis.
• Clinical suspicion of malignancy recurrence portends a poor prognosis, underscoring the importance of comprehensive diagnostic approaches.