Pleural Metastasis of Papillary Thyroid Cancer Depicted by 68Ga-FAPI PET/CT.

A 43-year-old woman with history of papillary thyroid cancer status post total thyroidectomy and neck dissection and multiple radioiodine therapy developed dyspnea and cough. CT scan of the chest showed left pleural thickening and pleural effusion. The pathology from pleural biopsy demonstrated the metastases from papillary thyroid cancer. 68Ga-fibroblast activation protein inhibitor PET/CT showed inhomogeneously increased uptake of fibroblast activation protein inhibitor in the thickened pleura.