PULSATING METASTASIS OF THE FEMUR FROM A SILENT HYPERNEPHROMA

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Abstract
Pulsating metastasis of bone is a rare phenomenon characteristic of primary carcinoma of the kidney or thyroid. In the case reported, a pulsating tumor of the greater trochanter of the femur originated from a silent hypernephroma. Nephrectomy did not favorably influence the metastasis. Bony metastases from thyroid and kidney carcinoma are very vascular. Communication with one or more large nutrient arteries accounts for their aneurysmal nature, visualized in this case by the injection of Diodrast (mixture of diethanolamine and diethylamine salts of 3-5 diiodo-4-pyridine-N-acetic acid) into the femoral artery. Pulsating metastases adjacent to large arteries have often been mistaken for aneurysms. Rarely a primary hemangioma of bone may pulsate.