Cytologic categorization of pancreatic neoplastic mucinous cysts with an assessment of the risk of malignancy: A retrospective study based on the Papanicolaou Society of Cytopathology guidelines. Cancer Cytopathol 2016 Apr;124(4):285-93
Date
12/01/2015Pubmed ID
26618476DOI
10.1002/cncy.21657Scopus ID
2-s2.0-84963984000 (requires institutional sign-in at Scopus site) 39 CitationsAbstract
BACKGROUND: Cytology plays a pivotal role in the preoperative diagnosis of pancreatic cysts. Here the Papanicolaou Society of Cytopathology (Pap Society) guidelines were used to reclassify and assess the malignancy risk of cytology diagnoses of histologically proven pancreatic neoplastic mucinous cysts.
METHODS: A database search (January 2000 to June 2014) was performed for pancreatic neoplastic mucinous cyst resections with endoscopic ultrasound-guided fine-needle aspiration within the preceding year. Histologic diagnoses were reclassified according to the 2010 Word Health Organization criteria. For atypical/suspicious/positive cytology diagnoses, the cytology slides were reviewed, blinded to the histologic diagnoses. The cysts were reclassified according to the Pap Society guidelines, and the findings were correlated with the histology.
RESULTS: One hundred thirty-eight cases of pancreatic neoplastic mucinous cysts were retrieved. Eleven cases with atypical/suspicious cytology diagnoses with unavailable slides were excluded. The remaining 127 cases included 81 intraductal papillary mucinous neoplasms and 46 mucinous cystic neoplasms. The sensitivity of cytology for the diagnosis of neoplastic mucinous cysts was 76.4%. The sensitivity, specificity, and accuracy of cytology for the diagnosis of malignancy (high-grade dysplasia or worse) were 48.3%, 94.9%, and 84.3%, respectively. The risk of malignancy was 17.4% for the nondiagnostic category, 0% for the negative category, 13% for the neoplastic category, 63.6% for the atypical category, 80% for the suspicious category, and 100% for a positive diagnosis.
CONCLUSIONS: This study reveals that the Pap Society guidelines allow the accurate categorization of pancreatic neoplastic mucinous cysts with cytology. The diagnostic categories (from negative to positive) are associated with an increasing risk of malignancy, and this can further aid in patient management and risk stratification.
Author List
Smith AL, Abdul-Karim FW, Goyal AMESH terms used to index this publication - Major topics in bold
Adenocarcinoma, MucinousCell Transformation, Neoplastic
Cohort Studies
Cytodiagnosis
Databases, Factual
Diagnosis, Differential
Endoscopic Ultrasound-Guided Fine Needle Aspiration
Female
Humans
Immunohistochemistry
Male
Neoplasm Invasiveness
Neoplasm Staging
Pancreatectomy
Pancreatic Cyst
Pancreatic Neoplasms
Practice Guidelines as Topic
Retrospective Studies
Risk Assessment
Sensitivity and Specificity
Societies, Medical
