INTERPRETATION OF THE 67Gd PHOTOSCAN

Gallium-67 citrate is used to locate sites of tumor involvement throughout the body. In or der to make proper use of this new agent, a knowledge of the normal ' t.u distribution and physiological variations is necessary. For this report, over 400 whole-body rectilinear scans using 35 fid/kg "~Ga citrate were reviewed. At 48 hr, normal 6~Ga activity is concentrated in the axial skeleton, liver, spleen, and around the large joints. Foci of uptake are often seen in the salivary, lacrimal, and mammary glands. Activity is also found in the region of the naso pharynx. Under certain physiological condi tions, intense localisation may occur within the breast, bowel, and long bones. These variations may mimic malignant tumors. Lymph nodes involved by malignant disease present a dis tinctive pattern that aids in their identification.