Summary
Angioscintiphotography with 99mTc has been performed in 310 cases of spaceoccupying kidney lesions with the purpose
of establishing the diagnostic value of the kidney perfusion. In the presence of a
neoplasm, a more or less marked blood flow in the lesion generally appears as a hot
area. This pattern is not observed in poorly vascularized carcinomas or in Wilms’
tumors. The percentage of poorly vascularized tumors is moderate and does not affect
the value of the method. Cystic lesions appear usually to be cold. Large cysts exhibit
no uptake; on the contrary, the degree of vascularization in the small cysts is more
difficult to evaluate, as the normally supplied surrounding parenchyma overlaps the
cold area caused by the cyst. In the evaluation of the angioscintiphotographic picture,
we must take into account the concomitant hepatic or splenic vascularization, which
may cause some doubts of interpretation because of projection interferences. The renal
angioscintiphotography has an important rule in specifying the nature of a space-occupying
kidney lesion and may be regarded as a useful screening test.
