Characterization of eosinophils in a continuous ambulatory peritoneal dialysis patient with eosinophilic peritonitis

A continuous ambulatory peritoneal dialysis patient developed eosinophilic peritonitis and was followed for 7 months. After 1 month, the peritonitis resolved, with a concomitant drop in percentage of hypodense eosinophils (Eos) recovered from peritoneal dialysate (PD) as well as a drop in fluid major basic protein levels. Blood eosinophil differential percentages were low, but the percentage of hypodense Eos in the blood tended to be relatively increased. Stool samples showed no evidence of parasitic infection, and epicutaneous skin tests were negative. Leukotriene C4 levels remained relatively constant as did white blood cell counts. Flow cytometric analysis of lymphocytes and granulocytes from PD and blood revealed high levels of CD23-positive lymphocytes.