Optimal Volume Assessment for Serous Fluid Cytology

Konstantinos Christofidis; Maria Theochari; Stylianos Mavropoulos Papoudas; Lamprini Kiohou; Stylianos Sousouris; Areti Dimitriadou; Nikolaos Volakakis; Nicoletta Maounis; Panagiota Mikou

doi:10.3390/biomedicines12040899

Optimal Volume Assessment for Serous Fluid Cytology

Biomedicines. 2024 Apr 18;12(4):899. doi: 10.3390/biomedicines12040899.

Authors

Konstantinos Christofidis¹, Maria Theochari², Stylianos Mavropoulos Papoudas³, Lamprini Kiohou⁴, Stylianos Sousouris¹, Areti Dimitriadou², Nikolaos Volakakis², Nicoletta Maounis⁴, Panagiota Mikou¹

Affiliations

¹ Cytopathology Laboratory, "Laiko" General Hospital of Athens, 11527 Athens, Greece.
² Oncology Unit, "Hippokration" General Hospital of Athens, 11527 Athens, Greece.
³ Department of Biology, University of Crete, 70013 Heraklion, Greece.
⁴ Cytopathology Laboratory, "Sismanoglio-Amalia Fleming" General Hospital of Athens, 15127 Athens, Greece.

Abstract

Objective: This study aimed to investigate the optimal volume of serous fluid needed for accurate diagnosis using The International System for Reporting Serous Fluid Cytopathology (TIS), as well as to provide information on the distribution of serous effusion cases in the TIS categories (ND: non-diagnostic, NFM: negative for malignancy, AUS: atypia of undetermined significance, SFM: suspicious for malignancy, MAL: malignant) and relevant epidemiological data.

Methods: A retrospective analysis of 2340 serous effusion cases (pleural, peritoneal, and pericardial) from two hospitals between 2018 and 2020 was conducted. TIS categories were assigned to each case, and for 1181 cases, these were correlated with the volume of the analyzed fluid.

Results: Our study found statistically significant differences in volume distributions between certain TIS categories. Statistically lower volumes were observed in NFM compared to MAL, in UNCERTAIN (ND, AUS, SFM) compared to both MAL and NFM, and in NOT MAL (ND, NFM, AUS, SFM) compared to MAL. However, these differences were not substantial enough to hold any clinical relevance.

Conclusions: This study suggests that while fluid volume may slightly influence the TIS category, it does not impact the diagnostic accuracy of serous effusion cytology. Therefore, the ideal serous effusion specimen volume can be defined solely by practical parameters.

Keywords: The International System for Reporting Serous Fluid Cytopathology (TIS); optimal volume; serous effusion cytology.

Grants and funding

Funding for the current article’s publishing was provided by the First Department of Propaedeutic of Surgery of the “Hippokration” General Hospital of Athens.