Abstract
Normally, in 99mTc-diphosphonate-skeletal scintigrams the kidneys are delineated with the same intensity as the lumbar spine; This is not the case in patients with reduced renal function. In a series of 20 patients with varying degrees of renal insufficiency, a continuous decrease in the renal intensity with increasing serum creatinine was seen: clearly recognizable decreased renal intensity in patients with serum creatinine over 2 mg%, and no visualization of the kidneys in patients with serum creatinine over 8 mg%. This effect is intensified through a simultaneously existing hypercalcemia has the opposite effect, i.e., the intensity decrease is partially prevented. In patients with normal renal function a hypercalcemia even leads to an increased renal intensity. As a further cause for excessive renal intensity, an increased parenchymal transit time was found in the radionephrography in 5 out of 11 patients with normal serum creatinine in whom the increased renal intensity in the skeletal scintigram was a chance finding.
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