Abstract
123I-metaiodobenzylguanidine (MIBG) scintigraphy is an effective means of diagnosing chromaffin-cell tumors such as pheochromocytoma. We report a very rare case of a 45-year-old patient with large intra-abdominal mass and elevated urinary normetanephrines. 123I-MIBG scintigraphy showed mild MIBG uptake. Although initial findings suggested a pheochromocytoma, histologic examination along with immunohistochemical staining revealed features suggestive of gastrointestinal stromal tumor (GIST).
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