[The kidneys and urinary tracts, as demonstrated by skeletal scintigraphy with 99m technetium-methyl diphosphonate...

The kidneys and urinary tracts were evaluated in 465 patients during the course of skeletal scintigraphy. In 45 cases suspicion was aroused and in 35 abnormalities were demonstrated in the kidneys, ureters or bladder. In six patients the suspicion of an abnormality could not be confirmed on pathologic, urologic or radiologic examinations. In four patients absence of activity in the kidneys was due to disseminated osteoblastic metastases. In half these cases (17 patients) these findings had not been suspected. The appearances of various renal and urinary tract abnormalities, as seen on a bone scintigram, have been classified into five categories. The most common appearance is that of obstruction. The value of paying attention to the kidneys and urinary tract in the course of bone scintigrams is stressed.