The authors report a case of jejunal adenocarcinoma with distant metastases for which FDG PET succeeded in detecting the primary lesion and metastatic deposits. There were metastatic lymph nodes in the thorax and abdomen, but the primary lesion was unknown. Gallium-67 citrate scintigraphy was useful for visualizing the metastases in the thorax, but imaging was limited by physiologic accumulation in the liver and intestine. FDG PET showed all the metastases and suggested the primary site. FDG PET appears to be helpful in the diagnosis of jejunal adenocarcinomas.
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