[Contribution of intravenous urography to the etiological diagnosis of microscopic haematurias (author's transl)].

From a study of 216 patients with microscopic haematuria who were helped by technically complete intravenous urography (IU), the authors conclude that this investigations method is particularly valuable when haematuria is unaccompanied by proteinuria, pyuria or renal insufficiency. IU led to an etiological diagnosis in almost 50 p. cent of the patients revealing, among other causes, numerous calculi and a non-negligible number of tumours. Renal biopsy is very useful in cases with proteinuria but has few indications in isolated microscopic haematurias. The same applies to diagnostic angiography. Cystoscopy should be considered angiography. Cystoscopy should be considered when IU might be unable to detect small tumours of the bladder or, more generally, lesions of the vesical mucosa, particularly frequent in patients with pyuria.