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FIGURE 3. Bleeding scintigraphy performed on 82-y-old man whose presenting symptom was intermittent bright rectal bleeding. (A) Early dynamic imaging sequence after intravenous administration of 99mTc-RBCs (each frame is summed image of 5-min sequence) shows no definite area of abnormal radioactivity accumulation. (B) Later dynamic sequence starting 60 min after injection of 99mTc-RBCs clearly shows abnormal accumulation of radioactivity initiating in proximal descending colon and extending to whole descending colon, as also confirmed by subsequent SPECT (image not shown).
