[Right abdominal flank pain].

A 20-year-old female presented with right flank pain she had felt for two weeks. Colics, dysuria and fever were denied. The father and a sister of the patient were known to have cystic kidneys. Abdominal ultrasound revealed symmetrically enlarged kidneys with multiple cysts. Thus, the diagnosis of autosomal dominant polycystic kidney disease (ADPKD) was made. For a follow-up period of four years renal function has remained normal. An intercurrent urinary tract infection was treated with antibiotics. Blood pressure has been normal over the entire follow-up period. As yet, no specific treatment had to be initiated.