Fine-needle aspiration of the liver: a 10-year single institution retrospective review.

Fine-needle aspiration (FNA) of liver masses is a minimally invasive means of evaluation, with diagnostic accuracy over 85%. Given that most of the recent literature on sampling hepatic tumors was published by radiologists and gastroenterologists, we herein conduct a 10-year retrospective review of a single institution's cytopathology experience with the diagnosis of liver lesions. Electronic record review of the cytopathology files (CoPathPlus; Cerner Corp) was conducted for the 10-year interval January 2007 through December 2016. All cytology specimens designated as "liver" and "FNA" were included. Associated concurrent and subsequent surgical pathology and cytopathology cases were identified. All FNA cases were organized into four diagnostic categories: positive for malignancy, atypical, negative for malignancy, and non-diagnostic. There were 713 hepatic FNAs that were categorized as follows: positive for malignancy 467 (65.5%), atypical 49 (6.9%), negative 171 (24.0%) and non-diagnostic 26 (3.6%). Metastatic tumors (95.7%) were more common that primary (4.3%). The top two metastatic primary sites were pancreas (30.1%) and colon (12.7%). A total of 166 (23.2%) cases had concurrent core needle biopsies (CNB). 111 (66.9%) were concordant with the FNA diagnosis. Of the 55 discordant cases, 43 (25.9%) had diagnostic material only on CNB and 12 (7.2%) had diagnostic material only on FNA. The sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy were 93.4%, 96.7%, 98.2%, 84.3%, and 89.3% respectively. Irrespective of endoscopic versus percutaneous approach, hepatic FNA is a sensitive and specific means of identifying metastatic and primary malignancies of the liver.