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Guar bean in urinary cytology: a morphologic pitfall
Laila Nomani1, Schuharazad Abro1, Marcus L Quek2
1Department of Pathology and Laboratory Medicine, Loyola University Healthcare System, Maywood, Illinois.
Journal of the American Society of Cytopathology
|November 1, 2020
Summary
Vegetable material, identified as guar gum, was found as a contaminant in ileal conduit urine specimens. Familiarity with its cytomorphology is crucial for accurate urine cytology diagnosis.
Area of Science:
- Cytopathology
- Urology
- Materials Science
Background:
- Cytologic specimens can contain various contaminants.
- Ileal conduit urine cytology requires careful evaluation for artifacts and contaminants.
Purpose of the Study:
- To describe the cytomorphology of an encountered vegetable material in ileal conduit urine.
- To identify the source of origin of this vegetable material.
Main Methods:
- Retrospective search of ileal conduit urine cytology specimens (January 2015-April 2020).
- Analysis of ostomy procedures and devices used.
- Histologic preparation of ostomy devices, guar beans, and seeds.
Main Results:
- 17 urinary specimens from 8 patients showed vegetable contaminants.
- All patients used Coloplast SenSura Mio ostomy devices.
- Cytology revealed polygonal, thick-walled cells with a dark core, matching cells from ostomy adhesive and guar seeds.
Conclusions:
- The contaminant was identified as guar gum, a component of ostomy wafer adhesives.
- Recognizing the cytomorphology of guar cells is essential to prevent diagnostic errors in ileal conduit urine cytology.
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