Schwannoma of the ansa cervicalis

Schwannomas are rare neoplasms that originate from Schwann cells. We present a case report of schwannoma of the ansa cervicalis in a patient where preoperative imaging suggested thyroid pathology. A 25-year-old man presented to the otolaryngology department with a one-year history of an asymptomatic, anterior triangle neck swelling. Imaging and FNA suggested a cystic lesion of the thyroid. However, intraoperatively, the lesion was found between the right sternohyoid and thyrohoid and histology showed findings consistent with a diagnosis of schwannoma, determined to originate from the ansa cervicalis based on its anatomical position. Schwannoma of the ansa cervicalis is extremely rare and there have only been four reported cases in the literature. Schwannomas are often misdiagnosed and confused for other lesions. In our case report we add to the sparse literature on this pathology and highlight common pitfalls in diagnosis and discuss the principles of management of this rare condition.