Complete resolution of autoimmune thyroiditis after R-CHOP in a patient with thyroid lymphoma.

Hashimoto's thyroiditis is a known risk factor for the development of primary thyroid lymphoma. How the treatment of primary thyroid lymphoma influences thyroid function is however largely unknown. This case shows that treatment with R-CHOP chemotherapy can lead to a recovery of thyroid function in a patient with severe hypothyroidism, without thyroid hormone supplementation. Furthermore, this case shows that in patients with primary hypothyroidism and a rapidly enlarging, asymmetrical thyroid, fine needle aspiration should be performed to rule out primary thyroid lymphoma.