Malignant thyroid lymphoma presenting as acute airway obstruction.

Malignant thyroid lymphoma is an uncommon form of thyroid cancer which most commonly presents in elderly women. Most patients demonstrate a rapidly enlarging mass and may show tracheal deviation on chest roentgenogram. Radioisotopic scanning of the thyroid often demonstrates a "cold" or "cool" process of decreased uptake in the affected area. There is often an underlying lymphocytic thyroiditis process noted. Unfavorable prognosis is related to extracapsular extension, blood vessel wall infiltration, diffuse architectural pattern, and cervical lymph node involvement. We present two unusual cases of thyroid lymphoma presenting with acute airway obstruction and review the literature concerning this subject. One case presented a clinical and radiographic appearance similar to a prevertebral space abscess.