VISUALIZATION OF A RECURRENT CARCINOID-TUMOR AND AN OCCULT DISTANT METASTASIS BY TECHNETIUM-99M-SESTAMIBI

We present a case of atypical carcinoid that showed avid uptake of ses tamib in a recurrent bronchial carcinoid tumor and a solitary, unsuspe cted, occult, bony metastatic lesion in the distal femur. As carcinoid tumors are known to be vascular, we suspect that its avidity for sest amibi is secondary to increased blood flow, although other factors suc h as the transmembrane potentials of plasma and mitochondrial membrane s and relative number of mitochondria present in the cells of this car cinoid tumor, may have also played a role.