In infective cases of peritoneal dialysis (PD) peritonitis, examination of the effluent fluid usually shows a predominance of neutrophils, and a bacterial organism is frequently isolated by culture. Where no organisms are identified, cases are often referred to as culture-negative ‘peritonitis,’ but non-infective causes for cloudy effluent are rare. We report the unusual finding of cloudy effluent as a presenting sign of recurrent lymphoma, diagnosed by cytological examination of the peritoneal effluent.
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