Gas-forming infection in a renal cyst of a patient with autosomal dominant polycystic kidney disease.

Kimura's disease in a patient with idiopathic dilated cardiomyopathy on ambulatory peritoneal dialysis Sir, Kimura's disease, endaemic in Asia, manifests as solitary or multiple subcutaneous nodules in the head and neck, marked peripheral eosinophilia and elevated serum IgE [1]. Many cases of this are associated with nephrotic syndrome of unknown cause; and there is no evidence in these patients for a relationship between the end-stage renal disease and Kimura's disease. We describe a patient on chronic ambulatory peritoneal dialysis (CAPD) with a unique concomitant presentation of idiopathic dilated cardiomyopathy and Kimura's disease. A 17-year-old Taiwanese boy was diagnosed as having nephrotic syndrome when he was 12 years old, and he was treated with oral prednisolone. Then he was lost to follow-up, having turned to traditional Chinese herbal drugs. At the age of 16, he presented at our hospital again with dyspnoea and oliguria. Haemodialysis was performed initially because of acute pulmonary oedema; then he received CAPD. Idiopathic eosinophilia was noted at this admission [white blood cells 50–450/ml)]. His IgE was 2098 IU/ml (normal <200 IU/ml) and his haemoglobin was 9.9 mg/dl. About 6 months later, two subcutaneous nodules were found in his neck. Excisional biopsy was done which showed florid germinal centres, eosinophilic infiltration, eosinophilic abscesses and an increase of post-capillary venules—findings compatible with Kimura's disease [2]. The patient's cardiothoracic ratio (CTR) was 57.8%. Cardio-echography revealed dilatation of all four chambers with poor left ventricular performance [left ventricular ejection fraction (LVEF) 46%] and moderate pericardial effusion. Idiopathic dilated cardiomyopathy was diagnosed. The patient, however, refused pericardiocentesis or myocardial biopsy. We tried methylprednisolone 500 mg intravenously for 3 days then oral prednisolone 40 mg/day tapered to 10 mg/day for 6 months. His eosinophil count decreased from 3429 to 391/ml (from 34.5 to 6.1 as a percentage of WBCs). His CTR remained essentially unchanged (58.2%), and his left ventricular function did not improve (LVEF 45%) after 6 months of steroid treatment. Since then, the patient has not received steroids, because he has had no appreciable improvement of cardiac function. A systemic component is usually absent in Kimura's disease, but the disease is often associated with proteinuria and nephrotic syndrome [3]. In our case, we could not identify the aetiology of idiopathic dilated cardiomyopathy because myocardial biopsy was not performed. We can, however, exclude dialysis-related cardiomyopathy, because the patient was well nourished and free from oedema, and he had the following laboratory parameters: …