Abstract
B ECAUSE OF colon carcinoma with a post left hemicolectomy, a 60 year old man underwent bone scan using technetium 99m hydroxymethylene diphosphonate. The study showed an area of increased uptake in the skull and in the left hip region; the left kidney was not visualized. In addition, there was an area of faintly increased radioactivity in the left side (Fig 1), corresponding to abdominal and retroperitoneal masses seen in computed tomography (CT) of the abdomen (Fig 2). A percutaneous retroperitoneal biopsy confirmed the lower mass to be poorly differentiated adenocarcinoma consistent with metastasis from the previous colon carcinoma. A liver-spleen scan using 99mTC sulfur colloid was essentially negative (Fig 3). In addition to the bulky metastatic mass shown in this case, causes of diffuse radioactivity in the thoracoabdominal region in bone scintigraphy are as follows.
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