follicular carcinoma

Background. Inflammatory myofibro­blastic tumors are extremely rare neoplasms of unknown etiology and can occur at any anatomic location but most commonly are found in lungs and gastrointestinal tract. Inflammatory myofibroblastic tumors of thyroid are usually benign with no incidence of recurrence, however extrathyroidal neoplasms may exhibit malignant transformation with fatal outcome.