[Follow-up of patients with microhematuria].

Out of 100 patients with asymptomatic microhaematuria 21 patients showed an underlying pathological condition. In 23 patients glomerular (= dysmorphic) erythrocytes were seen on phase-contrast microscopy. Follow-up of the remaining 56 patients (over 2 to 10 years) showed the subsequent appearance of pathological urological findings in 14.3% of cases including three tumours (hypernephroma, cancer of the renal pelvis and bladder papilloma) 24 to 30 months after the diagnosis of microhaematuria. The necessity of prolonged urological observation in patients with non-glomerular (eumorphic) microhaematuria is discussed.