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Decoy cells
Decoy cells are virally infected epithelial cells that can be found in the urine. Decoy cells owe their name to their strong resemblance to cancer cells, and may as such confuse the diagnosis of either viral infection or urothelial malignancy. ==Epidemiology and Presentation== Decoy cells are mostly prevalent in immunocompromised individuals, such as transplant recipients who are treated with immunosuppressive medication in order for their immune system not to reject the foreign transplanted organ. Several viruses mediated the emergence of decoy cells, amongst which cytomegalovirus and polyomavirus. Decoy cells are virus infected urothelial cells with a distinct morphology of enlarged nuclei and intranuclear inclusions. In renal transplant recipients, such cells may be found in up to 40 percent of cases. Decoy cells are clinically relevant since they may be used as a prognostic marker for clinical conditions such as polyomavirus BK-induced nephropathy in renal transplant recipients, and haemorrhagic cystitis in haematopoietic stem cell transplant recipients.〔
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