A patient had swelling of the right calf. She also had a history of a Baker's cyst of the right knee. A radionuclide venogram was performed to rule out thrombophlebitis of the right lower extremity. Evidence of old thrombophlebitis was seen on the left side. On the right, delayed views demonstrated a large collection of radioactivity in the calf, which was not that usually seen with clot formation. An arthrogram performed later demonstrated a dissection of a Baker's cyst that correlated with the findings on the radionuclide venogram.
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