Early Diagnosis of Papillary Carcinoma in a Thyroglossal Duct Cyst: A Multidisciplinary Approach and the Crucial Role of Fine-Needle Aspiration Cytology.

Papillary carcinoma within a thyroglossal duct cyst is a rare and challenging presentation of thyroid malignancy, requiring a nuanced approach to diagnosis and treatment. This report details the case of a 40-year-old male who presented with a two-year history of submental swelling and intermittent respiratory difficulty. Initial imaging suggested a simple thyroglossal duct cyst. However, pathologist-performed fine-needle aspiration cytology (FNAC) revealed atypical cells consistent with papillary carcinoma within the cystic wall. Subsequent imaging uncovered additional suspicious thyroid nodules. A multidisciplinary team recommended total thyroidectomy combined with the Sistrunk procedure to remove the cyst and confirm the nature of the thyroid lesions. Histopathological analysis of the surgical specimens confirmed the presence of primary papillary carcinoma within the thyroglossal duct cyst and benign nodular thyroid hyperplasia. Given the findings, postoperative management involved clinical surveillance rather than adjuvant therapy. This case highlights the critical role of FNAC in the early diagnosis of thyroglossal duct cyst carcinoma and underscores the importance of a multidisciplinary approach in managing such complex cases. The discussion explores the rarity of this condition, the diagnostic challenges it presents, and the therapeutic dilemmas involved, particularly the decision-making process surrounding the extent of surgical intervention. Early diagnosis of papillary carcinoma within a thyroglossal duct cyst is crucial for effective management and patient outcomes. The integration of FNAC, detailed imaging, and multidisciplinary collaboration facilitates accurate diagnosis and appropriate surgical planning. Despite the absence of standardized treatment protocols due to the rarity of this pathology, the case demonstrates that a tailored approach - based on established diagnostic criteria and individualized patient assessment - can lead to successful management. Ongoing research and documentation of similar cases are essential to refine treatment strategies and improve prognostic outcomes for patients with this unusual presentation of thyroid carcinoma.