Rapidly Growing Thyroid Schwannoma: Diagnostic Challenges and Management Strategies.

Thyroid nodules are one of the most commonly encountered conditions in clinical endocrinology. Most thyroid nodules are of epithelial origin. However, primary thyroid mesenchymal tumors (TMTs), arising from the mesenchymal tissue, are being increasingly recognized. More than 20 different forms of benign and malignant TMTs have been described in the literature. Thyroid schwannoma is an extremely rare type of TMT, with only a few cases reported to date, accounting for less than 1% of all schwannomas. It primarily affects adults, with no significant sex predilection, and is often discovered incidentally during evaluation for thyroid nodules. Due to its rarity, the clinical presentation and natural history remain poorly understood, underscoring the importance of histopathological examination for accurate diagnosis and management. We describe a case of a patient with thyroid schwannoma who was diagnosed and managed at our center, contributing valuable insights to the limited body of knowledge on this rare entity. This is followed by a detailed description of the clinical features, diagnosis, and management of thyroid schwannomas.