[Hydronephrosis caused by enlarged retroperitoneal lymph nodes in sarcoidosis].

The diagnosis of sarcoidosis was made in a 40-year-old man when, in addition to enlarged mediastinal and hilar lymph nodes (sarcoidosis I), he also had peripheral lymph node enlargement. Pulmonary infiltrations (sarcoidosis II) developed subsequently. Three years after diagnosis pulmonary symptoms first became manifest, at the same time as pain in the kidney region. The urogram revealed hydronephrosis caused by enlarged retroperitoneal lymph nodes (CT scan). After treatment with corticosteroids the urogram was normal.