Ultrasound-Guided Fine-Needle Aspiration of Superficial Lymphadenopathy Performed by Interventional Pathologists: The Applicability of the Sydney System from 2 Years of Experience and 363 Cases.
INTRODUCTION
The Sydney system proposal for the study and reporting of lymphadenopathy by fine-needle aspiration (FNA) constitutes one of the first attempts to standardize this procedure. Here, we review its applicability.


MATERIALS AND METHODS
A retrospective study in which all ultrasound-guided FNAs (USFNAs) of superficial lymphadenopathy (palpable or not) performed by interventional pathologists in 2 specialized hospital centers were quantified over 2 years. The procedure was systematized, and the diagnoses were reclassified according to the Sydney system categories.


RESULTS
We analyzed 363 USFNAs of lymphadenopathies. The distribution of cases by categories was as follows: insufficient (n = 13; 3.58%), benign (n = 208; 57.30%), atypia of uncertain significance (n = 7; 1.93%), suspicious (n = 21; 5.79), and malignant (n = 114; 31.40%). The risks of malignancy calculated for categories I, II, III, IV, and V were 27%, 3%, 50%, 100%, and 100%, respectively.


CONCLUSION
The implementation of the Sydney system allows the systematization and standardization of the lymph node FNA methodology, with increased efficacy and efficiency. Assimilating the recommendations enables the qualification of the diagnostic procedure.
['Torres Rivas|Héctor Enrique|HE|', 'Villar Zarra|Karen|K|', 'Pérez Pabón|Lisseth Andrea|LA|', 'González Gutierréz|María de la Paz|MP|', 'Zapico Ortiz|Nuria|N|', 'Olmo Fernández|María Del Mar|MDM|', 'Nieto Llanos|Santiago|S|', 'Antoranz Álvarez|Natividad|N|', 'Gómez Martín|Ángel|Á|', 'Fernández Fernández|Luis Manuel|LM|']
D000293:Adolescent D000328:Adult D000368:Aged D000369:Aged, 80 and over D044963:Biopsy, Fine-Needle D002648:Child D005260:Female D006801:Humans D061705:Image-Guided Biopsy D008198:Lymph Nodes D000072281:Lymphadenopathy D008297:Male D008875:Middle Aged D011237:Predictive Value of Tests D015203:Reproducibility of Results D012189:Retrospective Studies D013030:Spain D018084:Ultrasonography, Interventional D055815:Young Adult
Fine-needle aspiration Interventional pathologist The Sydney system Lymph node cytology