Diagnostic features of low- and high-grade mucinous neoplasms in pancreatic cyst FNA cytology

Carlie Sigel, Xiao Jun Wei, Narasimhan Agaram, Keith Sigel, Roshan Raza, Rebecca Andrade, Rema Rao, Pari Shah, Kevin Soares, Abha Goyal

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Background: Pancreatic cyst cytology evaluates for neoplastic mucin and epithelial grade. This study describes cytological features of low- and high-grade mucinous neoplasms (MNs) using gastrointestinal contaminants for comparison. Methods: Histologically confirmed pancreatic cystic neoplasms were reviewed by a panel of cytopathologists to identify which, among 26 selected cytologic features, correlate significantly with low- and high-grade MN. A test for greater than or equal to four of eight high-grade features (three-dimensional architecture, high nuclear:cytoplasmic ratio, moderate nuclear membrane abnormalities, loss of nuclear polarity, hyperchromasia, >4:1 nuclear size variation in one cluster, karyorrhexis, and necrosis) was assessed for identifying a high-grade neoplasms. Additional characteristics of the cohort such as cyst fluid carcinoembryonic antigen results, molecular testing, Papanicolaou Society of Cytopathology classification, and select high-risk clinical features are described. Results: Endoscopic ultrasound fine-needle aspirations from 134 MN and 17 serous cystadenomas containing gastrointestinal contaminants were included. The MN consisted of 112 (84%) intraductal papillary MNs (low-grade = 69, 62%; high-grade = 24, 21%; and invasive = 19, 17%) and mucinous cystic neoplasms (low-grade = 20, 90%; high-grade = 2, 10%). Half had greater than five clusters of epithelium for analysis. Compared with gastrointestinal contaminants, mucin from MN was thick and colloid-like (40% vs. 6%, p <.01), covered >20% of the smear area (32% vs. none, p <.01), and contained histiocytes (46% vs. 18%, p =.04). Greater than or equal to four of eight select high-grade features was present in 36% of high-grade MN with sensitivity 37% and 98% specificity. Conclusion: Colloid-like features, >20% of smear, and histiocytes correlated with MN. Testing for greater than or equal to four high-grade features had low sensitivity and high specificity for high-grade MN.

Original languageEnglish
Pages (from-to)325-336
Number of pages12
JournalCancer cytopathology
Volume131
Issue number5
DOIs
StatePublished - May 2023

Keywords

  • PSC classification
  • cytology
  • grading
  • intraductal papillary mucinous neoplasm
  • mucin
  • mucinous cystic neoplasm
  • pancreas
  • serous cystadenoma

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