[Rare complications in polycystic kidney--the difficulties in their diagnosis and treatment].

The development of some rare complications of renal polycystosis is discussed. Four patients with chronic polycystosis with complications are followed up. In 3 of them (2 of them on chroniodialysis) the cysts suppurated and after an infective conservative treatment they were treated surgically-puncture, cyst excision and unilateral nephrectomy.

[Chronic pyelonephritis in polycystic kidney].

The characteristics of chronic pyelonephritis are studied in 37 patients out of a total of 53 patients with proved renal polycystosis. A group of 71 patients with chronic pyelonephritis selected at random are used as a control group. The frequency of chronic pyelonephritis among the patients with renal polycystosis is 69.

[Secondary cystic changes in the kidneys in chronic kidney failure].

In patients with chronic renal failure the presence and frequency of acquired cystic changes in the kidneys (acquired cystic renal disease) were studied. 46 patients, 21 to 62 years of age and duration of hemodialysis treatment from 2 up to 126 months, were examined. The patients with polycystic kidneys were excluded.