A retrospective analysis of serous effusions based on the newly proposed international system for reporting serous fluid cytopathology: a report of 3633 cases in an oncological center

Table 3 Subclassification of the indeterminate categories of AUS and SFM and the corresponding risk of malignancy(ROM)

Subclassification of AUS/SFM	No.(%)	Surgical pathology/clinical diagnosis		ROM
Subclassification of AUS/SFM	No.(%)	Benign	Malignant	ROM
AUS	96	46	50	52.1%
SFM	677	4	673	99.4%
SFM-A	333	4	329	98.8%
SFM-B	344	0	344	100%
Total	773	50	723	93.5%

SFM-A: There were rare cells displaying moderate-to-severely atypical features that were qualitatively insufficient to confidently exclude malignancy; SFM-B: There were rare cells displaying severely atypical features that were suspicious for malignancy but quantitatively insufficient for ancillary studies
Abbreviations: AUS atypia of undetermined significance, SFM suspicious of malignancy

ISSN: 1746-1596