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Background To evaluate FCH‐PET/CT and parathyroid 4D‐CT so as to guide surgery in patients with primary hyperparathyroidism (pHPT) and prior neck surgery. Methods Medical records of all patients referred for a FCH‐PET/CT in our institution were systematically reviewed. Only patients with pHPT, a history of neck surgery (for pHPT or another reason) and an indication of reoperation were included. All patients had parathyroid ultrasound (US) and Tc‐99m‐sestaMIBI scintigraphy, and furthermore, some patients had 4D‐CT. Gold standard was defined by pathological findings and/or US‐guided fine‐needle aspiration with PTH level measurement in the washing liquid. Results Twenty‐nine patients were included in this retrospective study. FCH‐PET/CT identified 34 abnormal foci including 19 ectopic localizations. 4D‐CT, performed in 20 patients, detected 11 abnormal glands at first reading and 6 more under FCH‐PET/CT guidance. US and Tc‐99m‐sestaMIBI found concordant foci in 8/29 patients. Gold standard was obtained for 32 abnormal FCH‐PET/CT foci in 27 patients. On a per‐lesion analysis, sensitivity, specificity, positive and negative predictive values were, respectively, 96%, 13%, 77% and 50% for FCH‐PET/CT, 75%, 40%, 80% and 33% for 4D‐CT. On a per‐patient analysis, sensitivity was 85% for FCH‐PET/CT and 63% for 4D‐CT. FCH‐PET/CT results made it possible to successfully remove an abnormal gland in 21 patients, including 12 with a negative or discordant US/Tc‐99m‐sestaMIBI scintigraphy result, with a global cure rate of 73%. Conclusion FCH‐PET/CT is a promising tool in the challenging population of reoperative patients with pHPT. Parathyroid 4D‐CT appears as a confirmatory imaging modality.

Background. Outcomes vary among patients with radioiodine refractory (RR) differentiated thyroid cancer (DTC). The prognostic factors for survival are not well-known, resulting in difficulty in selectingpatients for newtargetedtherapies.We assessed overall survival (OS) and cancer-specific survival (CSS) from RR-DTC to identify prognostic factors associated with survival. Patients and Methods. The data on all cases of metastatic RR-DTC treated in our center from 1990 to 2011 were retrospectively reviewed. Survival was estimated using the Kaplan-Meier method; associated prognostic factors were assessed using Cox's model. Results. Of 153 cases of metastatic DTC, 59% (n 5 91) met a criterion for RR: that is, 60% (n 5 55) had at least 1 metastasis without