A Rare but Significant Cause of an Enlarging Neck Mass: A Case Report of Primary Thyroid Lymphoma.

Primary thyroid lymphoma is a rare form of non-Hodgkin's lymphoma that typically presents as a rapidly enlarging goiter in patients with a history of autoimmune thyroid disease. We present the evaluation, pitfalls in diagnosis, and treatment of a 49-year-old woman with diffuse large B-cell primary thyroid lymphoma presenting with airway obstruction.