Recurrence of thyroid carcinoma in cervical soft tissue following surgical implantation: Case report

IntroductionThyroid cancer is the most common type of malignant endocrine cancer. Differentiated thyroid cancer, which includes papillary and follicular cancers, represents majority (90%) of all thyroid cancers and has a favorable prognosis.However, a minority of patients develops loco-regional recurrence.Case reportWe report here a rare case of a 63 years-old man who underwent total thyroidectomy in 2015 for multinodular goiter whose histopathological examination revealed a papillary thyroid carcinoma. He received 6 weeks later a 100 mCi of radioactive iodine therapy. In 2017, he was admitted for multiple cervical lymph nodes with high serum thyroglobulin level (234 ng/mL) which required a bilateral central and lateral neck dissection. He was readmitted in 2019 for multiple subcutaneous neck nodules with high serum thyroglobulin level (197 ng/mL). The histopathological examination of the excised nodules revealed a papillary thyroid carcinoma. The patient showed no sign of recurrence after 2 years follow-up.ConclusionLocal soft tissue recurrence followed surgical implantation should be suspected when nodules are determined alongside the thyroid after previous thyroid surgery. Therapy for these soft tissue implants may be difficult; a comprehensive long-term postoperative evaluation should be completed to minimize the risk of recurrence in cervical soft tissue.