Improved techniques in radionuclide imaging of prostatic lymph nodes.

Further improvements have been made in the technique of human prostatic lymphoscintigraphy, allowing better anatomical localisation of the areas of uptake of activity. A single median injection into the capsule of 99mTc labelled antimony sulphide colloid has been found to give as good imaging as 2 injections on either side of the midline. By placing markers on the umbilicus, pubic symphysis and both anterior superior iliac spines, a "pelvic grid" can be superimposed on the antero-posterior view. Further help with accurate localisation may be attained by taking 3 views; antero-posterior, postero-anterior and lateral, in 9 instances, prostatic injection was performed without any sedation or anaesthesia. The resulting scintigrams were indistinguishable in quality from those of anaesthetised patients.