Increased 99mTc Pertechnetate Uptake But Unimpressive 131I Activity in the Metastatic Mediastinal Lymph Nodes in a Thyroid Cancer Patient

摘要

False negative I-131 accumulation in metastatic lesions of thyroid carcinoma could be due to various etiologies. Here we present a 33-year-old woman with a history of papillary thyroid cancer who had increased Tc-99m pertechnetate activity in the mediastinal metastatic lymph nodes, which was not clearly seen on whole body I-131 scan due to adjacent activity from lung metastases.