A case of radiation nephritis was diagnosed by the effect of delayed e
xcretion of Tc-99(m) MDP on the superomedial aspects of both kidneys,
which had been included in a radiation port to the thoracolumbar spine
6 months previously. Knowledge of the past history of radiotherapy an
d the radiation port, together with the classic scintigraphic features
enable the diagnosis of this rarely demonstrated condition to be made
.