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Figure 6. A 26 year old woman with papillary carcinoma of thyroid. Her tumor does not secrete Tg. The first post-surgical scan showed bilateral positive nodes in her neck and the follow-up scan showed clearing after one RAI treatment. She then developed recurrent neck node disease. After a bilateral neck dissection she had a negative post-therapy RAI scan. However the FDG PET scan showed multiple nodes in the upper mediastinum, a finding confirmed by a subsequent CT scan. The image is a coronal section. The margins of the neck are defined by FDG uptake into the sternocleidomastoid muscles and the positive nodes are located centrally.

Figure 7. A woman in her 60s who has pulmonary and neck metastases from a papillary carcinoma that does not take up iodine as in (a). The tumor avidly concentrates 111In-pentetreotide (b). Note the intense focus in the anterior neck and the multiple lung lesions. The neck mass corresponds to palpable disease.

Figure 7. A woman in her 60s who has pulmonary and neck metastases from a papillary carcinoma that does not take up iodine as in (a). The tumor avidly concentrates 111In-pentetreotide (b). Note the intense focus in the anterior neck and the multiple lung lesions. The neck mass corresponds to palpable disease.

prescription concerning contacts with family and other close associates based on measurements of dose retention from the diagnostic uptake.

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