[Differential diagnosis of pyeloureteritis cystica, follicularis et granularis].

At the instance of the observations of two patients the differential-diagnostic difficulties in the pyeloureteritis cystica and the ureteritis follicularis or granularis are described. Here first of all the following other diseases must be excluded: 1. neoformations in the upper urinary tract, 2. uro-tuberculosis, 3. X-ray-negative calculi, 4. HWI with gas-producing germs. The knowledge of the X-ray diagnostic criteria of the individual diseases is often of life-important significance for making a certain diagnosis for the patient. For this reason also the performance of a retrograde ureteropyelogramme may be indicated, if, exhausting all possibilities of the excretion urography, a diagnostic ascertainment is not possible.