Multiple Endocrine Neoplasia Type 2B Unmasked by 18 F-FDG PET/CT and 131 I-MIBG SPECT/CT

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18F-FDG PET/CT was performed to detect an occult malignancy in a 26-year-old woman with complicated medical history which included paroxysmal hypertension and significantly elevated tumor marker. The images revealed lesions in the thyroid, lymph nodes, and bilateral adrenal glands. Further 131I-MIBG SPECT/CT revealed intense activity in the lesion in the left adrenal gland, which was consistent with pheochromocytoma. The pathology examination after subsequent neck biopsy demonstrated medullary thyroid carcinoma. A diagnosis of multiple endocrine neoplasia type 2B was eventually made.

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