Adult with infected spontaneous perinephric urinoma secondary to uro-obstruction by VUJ calculus: 'pop-off' mechanism.

An 18-year-old man presented with insidious, progressive right flank pain of 2-month duration, with fever of 2-week onset. Examination revealed right flank tenderness, with suspicion of ballotable right lumbar mass. No prior imaging had been undertaken. Blood examination revealed elevated leucocyte