Evaluation of the diagnostic utility of cytologic examination of renal fine-needle aspirates from dogs and the use of ultrasonographic features to inform cytologic diagnosis

Camille A. McAloney, Leslie C. Sharkey, Daniel A. Feeney, Davis M. Seelig, Anne C. Avery, Carl R. Jessen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

OBJECTIVE To describe cytologic characteristics of renal fine-needle aspirate (FNA) samples from dogs, evaluate proportions of cytologic specimens deemed adequate for interpretation (diagnostic yield), assess diagnostic utility of cytologic examination for neoplastic and nonneoplastic diseases, and characterize ultrasonographic features of evaluated kidneys to determine whether the imaging characteristics could be used to inform cytologic interpretations. DESIGN Retrospective, observational study. SAMPLE 102 cytologic specimens and 97 ultrasonographic studies from 100 dogs. PROCEDURES Medical records were reviewed to identify dogs that underwent ultrasound-guided renal FNA. Slides were categorized as adequate or inadequate for interpretation; adequate slides were used for retrospective cytologic diagnosis. Sensitivity, specificity, and predictive values of cytologic examination for detection of neoplastic and nonneoplastic conditions were calculated by comparison with histologic or lymphoid cell clonality assay results. Ultrasonographic characteristics of neoplastic and nonneoplastic renal lesions were described. RESULTS 74 of 102 (72%) specimens had slides adequate for interpretation; 26 were included in the diagnostic accuracy analysis. Sensitivity of cytologic examination was 78% and 50% for detection of neoplastic and nonneoplastic conditions, respectively, with specificities of 50% and 77%, respectively; sensitivity for detection of lymphoma was 100%. Ultrasonographic appearance of kidneys with confirmed neoplasia varied; masses were most commonly found in kidneys with carcinoma (5/5), lymphoma (5/7), or other neoplasia (3/4) and absent in kidneys with nonneoplastic conditions (n = 5). CONCLUSIONS AND CLINICAL RELEVANCE Renal FNA specimens were adequate for interpretation at rates comparable with those reported for other organs and were considered clinically useful for diagnosis of neoplasia. Imaging characteristics may potentially aid differentiation between neoplastic and nonneoplastic lesions; however, further investigation is needed.

Original languageEnglish (US)
Pages (from-to)1247-1256
Number of pages10
JournalJournal of the American Veterinary Medical Association
Volume252
Issue number10
DOIs
StatePublished - May 15 2018

Bibliographical note

Funding Information:
Supported in part by the Summer Scholars Program with internal funds from the College of Veterinary Medicine, University of Minnesota, Saint Paul. Presented in poster form at the Combined Annual Meeting of the American College of Veterinary Pathologists, the American Society for Veterinary Clinical Pathology, and the Society for Toxicologic Pathology, Minneapolis, Oct 2015. The authors declare that there were no conflicts of interest.

Funding Information:
Supported by the National Institutes of Health (grant No. K08 EY021142).

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