Matthew T. OlsonAnna NovakThiraphon BoonyaarunnateJessi TrotterSharon SachsDeidra KellySterling FordToby C. CornishAdam TollArmanda D. TatsasZahra MalekiYener S. ErozanDorothy L. RosenthalThe Johns Hopkins School of MedicineMahidol University2018-11-092018-11-092014-01-01Journal of the American Society of Cytopathology. Vol.3, No.3 (2014), 156-164221329452-s2.0-84899790571https://repository.li.mahidol.ac.th/handle/20.500.14594/34660Introduction: Cytologic screening for urothelial carcinoma is fraught with low sensitivity, a high indeterminate rate, and until recently, poor standardization of terminology. The Johns Hopkins Hospital John K. Frost Cytopathology Laboratory has recently developed and published a template for reporting urine cytopathology; herein, we evaluate its interobserver reproducibility. Materials and methods: Two sets of 100 cases each were deidentified; each set was reviewed by 5 of 10 observers in a randomized order at the direction of computerized data collection software that tracked observation time as well as observer classification of the atypia-no atypia, atypia (AUC-US), or atypia suggestive of high-grade urothelial carcinoma (AUC-H). Specific morphologic features were also recorded. Cases were grouped into low-, intermediate-, and high-agreement based on the number of observers who made the assessment. The findings were correlated against clinical outcomes. Results: High agreement among observers about the presence or absence of high-grade features was possible in approximately two-thirds of indeterminate urine cases. Time and order did not factor significantly into observer propensity for identifying atypical features or favoring either AUC-US or AUC-H, and cases with high agreement about the presence of high-grade features were more likely to have a malignant follow-up. Furthermore, AUC-H diagnoses based on 2 or more high-grade features had a significantly higher malignancy risk than AUC-US diagnoses did. Conclusions: AUC-H is a valid diagnostic category with specific, reproducibly identified features that portend a higher risk of malignancy than the findings of AUC-US. © 2014 American Society of Cytopathology.Mahidol UniversityMedicineArticleSCOPUS10.1016/j.jasc.2014.02.003