A 16-year-old girl with renal failure was transferred to our hospital
for an extensive renal examination. Computerized tomography and ultras
onography showed multiple small cysts throughout the medulla of both k
idneys. Histological findings revealed tubular atrophy and dilatation
and marked periglomerular fibrosis, all of which were compatible with
nephronophthisis. Her development and growth were normal. A prior urin
alysis, as well as her symptoms and family history were not helpful fo
r making a diagnosis, As early diagnosis of nephronophthisis is diffic
ult in some cases, more detailed screening is needed for children and
adolescents.