Guar bean in urinary cytology: a morphologic pitfall

Guar beans in a peritoneal fluid sample

“…At that time, through the use of search engines, we discovered academic articles and photomicrographs indicating that the forms were guar beans. [1][2][3] The reports showed that the beans were derived from adhesives used in collection bags of patients who had ileal conduits. Indeed, the confounding urine sample was derived from an ileal conduit, and we were able to confidently determine that the forms were an innocuous contaminant.…”

“…Of relevance to the present report, 2 years prior to analysis of the peritoneal fluid, we had been confounded by similar forms, which we had not previously encountered, in a urine sample (Figure 2). At that time, through the use of search engines, we discovered academic articles and photomicrographs indicating that the forms were guar beans 1–3 . The reports showed that the beans were derived from adhesives used in collection bags of patients who had ileal conduits.…”

“…Guar beans have been reported in urine samples obtained from ileal conduits 1–3 . The beans are contaminants from adhesives that secure urine drainage bags to post‐cystectomy patients.…”

Guar cells in urine cytology: Two case reports and literature review

“…Guar gum, also known as additive E412, is a natural hydrocolloid derived from the guar seed richly used in a variety of productions that include the food, textile, cosmetic, and pharmaceutical industries 5 . Currently guar gum is used in a variety of medical devices, including ostomy adhesives 6 …”

“…In 2012, Quiroga‐Garza et al described vegetable contaminant cells in a series of urinary diversion urine specimens, albeit no source for such contaminants was established 8 . More recently, Planinšek et al 4 and Nomani et al 6 correctly identified guar bean cells in samples of ileal conduit urine, tracing its origin to the ostomy wafer adhesive (Coloplast adhesives); our study is the first to correctly identify guar bean cells in urine cytology from cutaneous ureterostomy (non‐ileal conduit reconstruction) related to the usage of Coloplast ostomy devices.…”