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Outcome of radioiodine therapy in thyroid cancer patients with recent contrasted computed tomography

Objective To document the outcome of radioiodine therapy (RIT) in differentiated thyroid cancer (DTC) patients with recent contrasted computed tomography (CCT). Methods Eighteen patients with DTC and recent thyroidectomy who underwent RIT within 90 days after a CCT were included. Disease status following RIT and whether the expected response to RIT was achieved were documented. Disease status was classified into one of three categories based on the patient’s thyroglobuline level, radioiodine scan (RIS), and other imaging modalities: no evidence of disease (NED), microscopic residual disease (MRD), or gross residual disease (GRD). Expected response to RIT was based on the overall interpretation of the referring physicians of follow up thyroglobuline values, RIS findings and clinical assessment as reflected in progress notes. Follow-up stimulated thyroglobuline and (or) RIS was performed on average 10.8 months after RIT (median 12 months). The last progress note reviewed was on average 33.3 months after RIT (median 31 months). Results There were 12 patients with NED, two with MRD and four with GRD. Expected response to RIT was achieved in 17 patients. In one patient, the effectiveness of RIT could not be determined. Conclusion RIT in postthyroidectomy setting can be successfully performed within 90 days after CCT. Further research is needed to confirm our findings.